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.
Metamorfo botnet controller located at 52.161.4.23 on port 80 (using HTTP POST):
hXXp://hotliksjfu.isa-hockeynut.com/novidades/inspecionando.php
$ dig +short hotliksjfu.isa-hockeynut.com
52.161.4.23