Kakao Talk is a downloadable software application for mobile devices that allows its users to send and receive messages including photos, videos, voice messages, URL links, and contact information, both on a one-to-one basis and in groups, all for free. To use the application, you only need to enter your phone number without registering or logging-in.

This SonicWALL signature identifies legitimate Kakao Talk DNS request for kakaocdn.net. This is the static resources site for images, pictures, files and other static content.