Suspect false negative. Browser redirects to vq918450.com.

I suspect that a browser has been infected with malware. A user typed link into the browser search bar is redirecting to vq918450.com. A Comodo quick scan of the infected system reports no malware, and Comodo also doesn’t detect the malware in the browser’s installation directory or user settings. Possible sources of the infection include an installation of supposedly free software as well as potentially an infected browser extension. I believe that this may be a false negative.