Add Bahamut SafeChat IoC

[r-tx]

Malware deployed via phishing based attack and requires user intervention to install.

Cyfirma blog post:

• https://www.cyfirma.com/outofband/apt-bahamut-targets-individuals-with-android-malware-using-spear-messaging/

VirusTotal:

• https://www.virustotal.com/gui/file/8a35d0b20b6f057fe42e606a124cb84d78fa95900a16b056269f1cc613853989/details