A-fast.com is a misleading website that promotes the fake anti-virus called A-Fast Antivirus. A-fast.com or A-fast.net is typically encountered by users that are already infected with the trial version of A-Fast Antivirus. On infiltrating a system, A-Fast Antivirus will place A-fast.com in the victim's Hosts file, causing the browser to be frequently redirected to the malicious domain. Users may also be redirected to A-fast.com when they click on any of the fake security alerts or pop-up warnings displayed by A-Fast Antivirus. Should you encounter A-fast.com, have your PC scanned and cleaned with a legitimate malware removal tool.