The host at this IP address is obviously operated by cybercriminals. It 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 34.121.148.157 on port 443:
$ telnet 34.121.148.157 443
Trying 34.121.148.157…
Connected to 34.121.148.157.
Escape character is ‘^]’
Malicious domains observed at this IP address:
overview-banauthentserveblog.click. 600 IN A 34.121.148.157