adserver_misc on amazonaws being blocked

https : / / adserver-vpc-alb-2-1898430250.us-east-1.elb.amazonaws (dot) com and others similar are being blocked by Avast as URL:Mal . any idea if this is a real threat or not? We are getting blocks from multiple PC’s , probably all using Chrome or new Edge. No other similarity except they are all amazonaws adserver Thanks for your input