Avast for Business is indicating some sort of HTML malware (Iframe-inf) from one of the ad sites.
The full URI is:
https://cdn55-791926.c.cdn77.org/uCnckGLvmvDCMvmxv
The full URI is:
https://cdn55-791926.c.cdn77.org/uCnckGLvmvDCMvmxv