When they weren't part of the solution, they certainly were part of that general infrastructure issues.
But these CloudFront IP's addresses all were involved in some way in some manipulative schemes:
-54.192.28.224
-54.192.69.173
-54.192.100.25
-54.192.109.109
-54.192.132.11
-54.192.156.161
-54.192.199.175
-54.230.59.175
-216.137.36.177
polonus