How To Decrypt .Cdtt Files

I don't know if it's the right place to ask my question, if not I am sorry. I recently found all my files encrypted and I don't know what to do about it. I did notice .Cdtt extension in my files. All encrypted files got this extension and I am pretty sure none of my files had this extension before. Also, i found _readme.txt file in my system and it's asking me to pay $980 to decrypt my files. I did some Google search and found out my computer is infected with a Ransomware virus. There were several guides providing help with removing this virus and restoring my files. I am no tech-savvy, still, I tried to follow the instructions provided by one of the guides (here's the link to be exact). The guide mostly focused on removing the threat. Now i am not sure if the virus is really gone from my system or not. But my files are still encrypted. Is there any way to decrypt my files without paying the ransom??? I don't want to lose my files but i also can't afford to pay the ransom. What should i do?