As previously mentioned, close to 40% of phishing PDF files that we saw in 2020 were part of the fake CAPTCHA category. Figure 15 shows the hex content of a fake CAPTCHA sample (SHA256: 21f225942de6aab545736f5d2cc516376776d3f3080de21fcb06aa71749fc18f). We can see that the PDF file has an embedded Uniform Resource Identifier (URI) that points to [.]ru/pifykeyword=download+limbo+apk+full+game, which is a traffic redirector. As mentioned earlier, traffic redirection websites do not point to a fixed website, and they often redirect the user to a different website upon each visit.