A simple step-by-step guide how to host some files on S3 with a CloudFront in the front.

AWS S3 + CloudFront + Route53 = https://static.example.com

Create bucket:

• Name: static.example.com
• Uncheck "Block all public access"

Create folder:

• Name: buttons

Upload images there:

• https://s3-eu-west-1.amazonaws.com/static.example.com/buttons/my-button.png

Create distribution:

• Origin Domain Name: static.example.com.s3.amazonaws.com
• Viewer Protocol Policy: Redirect HTTP to HTTPS
• Price Class: Use All Edge Locations
• Alternate Domain Names (CNAMEs): static.example.com
• Custom SSL Certificate: (select example.com certificate)

Record the distribution domain name: random-string-123.cloudfront.net

Wait for the distribution status to become "Deployed", takes about 20min.

Create record set:

• Name: static.example.com
• Type: A
• Alias: YES
• Value: random-string-123.cloudfront.net

Results:

• https://static.example.com/buttons/my-button.png which can be used by others
• You could host any files this way, of course you will be paying for the distribution costs, albeit minuscule.

Source:

• AWS Docs - How do I use CloudFront to serve HTTPS requests for my Amazon S3 bucket?