There is no easier way unless you pay someone to do it for you. Even if you find the code, how did it get there? There is an exploit the hacker is taking advantage of.There's no way I have the time to go through all this and implement the steps.
Your server software is also dated, Outdated Web Server Nginx Found: nginx/1.4.4
https://sitecheck.sucuri.net/results/www.thedigitalventure.com/
Personally what I did is pay a security company to clean my site and now watch it for the bad stuff.