Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f95bd45ed050d7e…

MALICIOUS

PDF

41.6 KB Created: 2020-08-30 10:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b601fa3c1d047053fe5355866ffe091 SHA-1: 470f5032dcc7f62c800981758b0273fcf40e2308 SHA-256: 4f95bd45ed050d7e5a8a0498b1d5972b3ea420256dea95ed9df17ef8a6f11296
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO poisoning or to obscure malicious destinations. One of the primary links, 'https://ttraff.ru/wix?keyword=call+of+cthulhu+first+aid+kit', is flagged as a malicious redirector. The document body itself is heavily obfuscated and contains references to the redirector URL and other PDF links.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=call+of+cthulhu+first+aid+kit
    • https://static.usrfiles.com/ugd/b8c837_c24c944a9cb046c1acfeb53a213222cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_44b0347737ab4394b3e02defa38c2303.pdf
    • https://static.usrfiles.com/ugd/b8c837_0536c9bc57ad472bbb5a5fa32ff314f3.pdf
    • https://static.usrfiles.com/ugd/cafc24_cc7cc4ccd7034d5d82ade522b64eaa44.pdf
    • https://static.usrfiles.com/ugd/b8c837_c11c106f5308404e8bcecb6ab144af0b.pdf
    • https://cdn.shopify.com/s/files/1/0461/9200/1175/files/20402480423.pdf
    • https://cdn.shopify.com/s/files/1/0431/8366/9412/files/fadinagolixevenolanitor.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/skyrim_switch_title_id.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.pdf
    • https://cdn.shopify.com/s/files/1/0439/8183/2350/files/59050869246.pdf
    • https://static.usrfiles.com/ugd/b8c837_54b90e902b8b4aa9ade104185c577f00.pdf
    • https://static.usrfiles.com/ugd/ef7b09_0ba55928834a4de88a50382a0a1d6f71.pdf
    • https://static.usrfiles.com/ugd/b8c837_99ba59804ab64eb4abdcbe0392892358.pdf
    • https://static.usrfiles.com/ugd/b8c837_357b1d639daf40a4a9ae5e99878a32ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcca063b45c240baae00c600f19fdf43.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006561.bin
82251d06998384a7cddfad32d1d2f8191c55044749c9881a55684340618538d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6561 5080 bytes
font_01_sfnt_off0000769d.bin
6bebb04748f5cbb04c219fe3076bbeb6fdc1c251daacd64372e59cb1a3d11289		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769D 10240 bytes

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