Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0dd37c160410781…

MALICIOUS

PDF

38.6 KB Created: 2020-08-07 23:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af3f71299128f1748e4d0a2c3498fb77 SHA-1: 1251226eee133b0109fa82fd8c088d1b83f18154 SHA-256: f0dd37c1604107813028094dd323415ad717a92ffcbb06b770dbe37346466d27
150 Risk Score

Malware Insights

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

The PDF contains a prominent link to a redirector URL, which is flagged as malicious. The document body, though partially corrupted, contains text suggesting it is a lure for a free chess guide, likely to entice clicks on the malicious link. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm intended to improve SEO for the malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/pify?keyword=domine+las+aperturas+de+ajedrez+pdf+gratis
    • http://nopedop.lexingtonlawncarepros.com/uploads/1/3/0/8/130874655/diwiguvoxej.pdf
    • http://files.brigidcoleridge.com/uploads/1/3/1/4/131437680/buwefir-fefedaxofip-dododinapixag.pdf
    • http://files.springwoodinn.com/uploads/1/3/0/9/130969925/c0fe6c01c.pdf
    • https://cdn.shopify.com/s/files/1/0430/8048/2970/files/arthrographie_de_l_paule.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2021/files/96388579369.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/banozetav.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9575/files/53500167909.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/basic_css_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/6062/5562/files/58129403768.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2948/files/difowufuvojagozozizet.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/tuwape.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/11935287818.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71895612735.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2557/files/vejutokesumakulewejapafek.pdf
    • https://cdn.shopify.com/s/files/1/0429/7755/8681/files/jepugubaje.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_off000054cd.bin
31e221ce89bf97b47bf5871459727a6e6c961c6de755cabbc976c022776e6f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54CD 5484 bytes
font_01_sfnt_off00006776.bin
95be15c64b15944ce7e3f2116449580b471d44e0c376eedadb89f3ba57ee6933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6776 11204 bytes

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