I have checked their diagnostic page, resulting on these informations:
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Diagnostic page for cnc-source.com
What is the current listing status for cnc-source.com?
This site is not currently listed as suspicious.
Part of this site was listed for suspicious activity 2 time(s) over the past 90 days.
What happened when Google visited this site?
Of the 7 pages we tested on the site over the past 90 days, 3 page(s) resulted in malicious software being downloaded and installed without user consent. The last time Google visited this site was on 2012-05-26, and the last time suspicious content was found on this site was on 2012-05-23.
Malicious software is hosted on 1 domain(s), including url123.info/.
This site was hosted on 1 network(s) including AS24940 (HETZNER).
Has this site acted as an intermediary resulting in further distribution of malware?
Over the past 90 days, cnc-source.com did not appear to function as an intermediary for the infection of any sites.
Has this site hosted malware?
No, this site has not hosted malicious software over the past 90 days.
Diagnostic page for cnc-source.com
What is the current listing status for cnc-source.com?
This site is not currently listed as suspicious.
Part of this site was listed for suspicious activity 2 time(s) over the past 90 days.
What happened when Google visited this site?
Of the 7 pages we tested on the site over the past 90 days, 3 page(s) resulted in malicious software being downloaded and installed without user consent. The last time Google visited this site was on 2012-05-26, and the last time suspicious content was found on this site was on 2012-05-23.
Malicious software is hosted on 1 domain(s), including url123.info/.
This site was hosted on 1 network(s) including AS24940 (HETZNER).
Has this site acted as an intermediary resulting in further distribution of malware?
Over the past 90 days, cnc-source.com did not appear to function as an intermediary for the infection of any sites.
Has this site hosted malware?
No, this site has not hosted malicious software over the past 90 days.
Please, fix the issue.
Maybe a malvertisement or a RFI problem?