Adobe uses wildcard subdomains; allowing them to generate multiple subdomains all pointing to the same content. This is primarily done for analytic or load balancing reasons. The URL You are referring to might be : https://get3.adobe.com/flashplayer/update/plugin/
This link is safe and free from malware .
But make sure you uncheck the Mc-afee software before updating if you do not want it.
[topic moved to Flash Player forum]