Amazon Cloudfront S3 bucket policy makes all objects publicly accessible by default.

.json

{
  "Version": "2008-10-17",
  "Statement": [
    {
      "Sid": "AllowPublicRead",
      "Effect": "Allow",
      "Principal": {
        "AWS": "*"
      },
      "Action": "s3:GetObject",
      "Resource": "arn:aws:s3:::replace-with-folder-name/*"
    }
  ]
}