I think this is a bot but

[aristotle]

Here's one from AWS:

Host: 54.162.160.21 
 / 
 Http Code: 200 Date: Jun 25 10:23:28 Http Version: HTTP/1.1 Size in Bytes: 11242 
 Referer: - 
 Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/538.1 (KHTML, like Gecko) splash Safari/538.1 

It downloads images and executes the statcounter code. If I remember correctly, some Semalt varieties also do this, but most other bots don't. But this doesn't look like it has any connection to semalt

Also, what does "splash" mean in a UA

[blend27]

[github.com...] --- maybe? and given that it comes from AWS...

[lucy24]

Hard to say without headers. Under what circumstances, though, would a human be browsing from a 54 IP? Employees on lunchbreak, sure, but if they're actively looking for something, then human-vs-robot may be a pretty academic distinction. Like those recurring Drake Holdings visits discussed in other threads, most of us don't really care whether it's technically a human or a robot. (Semalt and similar referer spam are robots running off infected human browsers. Those are easy to identify by headers.)

For myself I'm always suspicious of visitors who just look at the front page and nothing else. But that obviously depends on how your site is laid out.

[keyplyr]

Don't think any AWS "Employees on lunchbreak" would be browsing the web from these cloud computing ranges. In-house AWS employees are on Amazon Inc ranges and the other employees connect from home on their ISP.

I guess there is a chance an account owner could install an HTTP web client capable of browsing, but why? They already connect to their account with a browser on their ISP.