Sure, I can help you track this down. Just to be clear, I suspect that this code is coming from a plugin you have installed or else it’s integrated into your theme files. Also, as these images are clearly used for metrics, I am not convinced that this is even a malicious injection.
I can see that there is a meta tag in your HTML HEAD with the property “og:image” which loads content from reddogdangerous…
Also, as I said before, I see some hidden images in the first fusion-flip-box column on your home page.
I realize that this Avada theme you are using is a premium theme which usually costs around $60 to download. So I can’t help but jump to the most likely conclusion which would be that the developer of your site found some pirated/unofficial copy of this theme available from some other source either for free or at a steep discount. Unfortunately, when you download a premium theme from a free download site is it almost always hacked or modified in some way to benefit to the 3rd-party who pirated the original theme. They might add malware or even a back-door, or it might just be a little tracking include which is what I think you got, or I could by completely wrong here and this code might have been added some other way.
So, first thing would be to check the header.php file in the Theme Editor of your wp-admin to see if that META tag with the reddogdangerous content is hard-coded into that theme file or if it’s being injected dynamically by some other PHP include.
You can send me the contents of the header.php if you don’t want to post it on this public forum:
eli AT gotmls DOT net