The host at this IP address (52.173.28.95) is either operated by cybercriminals or hosting compromised websites that are being used to distribute malware:
http://empower4talent.com/calendar/uf475/
http://empower4talent.com/calendar/swift/ok9syy7/
http://empower4talent.com/calendar/protected_resource/external_space/RykJtF_4g8jdHex53kw5y/
AS number: AS8075
AS name: MICROSOFT-CORP-MSN-AS-BLOCK