The host at this IP address is running a malware botnet controller which is being used to control infected computers (bots) around the globe using a trojan horse.
Malware botnet controller located at 5.135.171.85 on port 443:
$ telnet 5.135.171.85 443
Trying 5.135.171.85…
Connected to 5.135.171.85.
Escape character is ‘^]’
gcl-page.biz. 60 IN A 5.135.171.85