Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e91e2d9a36daeef…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 20:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b9e550cb0aeaeee5bc0dd01d416bb1e SHA-1: ffc29e7a079de124cfcff476651c0f80f5254eae SHA-256: 6e91e2d9a36daeef15b6bf30df5d2fa8f39da3a2418148a32871887d85e06e9c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains text related to a product review and the malicious URL, suggesting a lure to entice clicks. The presence of numerous other PDF links, many pointing to benign Shopify domains, indicates a potential link farm or SEO manipulation tactic to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=nook+tablet+10.+1+review
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1991/7720/files/totuxixidono.pdf
    • https://cdn.shopify.com/s/files/1/0440/1407/6069/files/heir_apparent_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/kiravafejefi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5963/2545/files/79457571274.pdf
    • https://cdn.shopify.com/s/files/1/0430/6698/2561/files/xanadu.pdf
    • https://static.usrfiles.com/ugd/97634b_965c9638ffc44a5a86da9b4d5cbb12e7.pdf
    • https://static.usrfiles.com/ugd/e2b09b_c00d50d1412e42d085feb7551a970a4d.pdf
    • https://static.usrfiles.com/ugd/e4ff69_de936ca453634ccba9ad9a82b1bade32.pdf
    • https://static.usrfiles.com/ugd/ed64d2_720e44868fbd49f58f6838d978376984.pdf
    • https://static.usrfiles.com/ugd/b8c837_1526747ca75a40349b438c9bd8466d4b.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006771.bin
e5c5f8eaa1fb07e54ababf2ed3f89b79092d694d48d9a981af53e4c5c7dc4acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6771 5052 bytes
font_01_sfnt_off000078d3.bin
f0bb86a93a8c4421ad79a7bf05966fdab6cc596929a86bd43c8113b3a34e527a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D3 10364 bytes

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