Malicious PDF — malware analysis report

Static analysis result for SHA-256 783a739426d455b6…

MALICIOUS

PDF

43.8 KB Created: 2020-08-29 09:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f27a27761ad0c46055297522bd73d6b1 SHA-1: 35f58f164bd27a0be38fc9f43d4c7b91eeda7d65 SHA-256: 783a739426d455b67fb70a6531bc8043fc74b8d78919f7a4107c37092d464cba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links to external PDF files hosted on Shopify, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ttraff.ru/wix?keyword=jeff+conrad+car+chasers+died+in+o+re', is identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The primary attack pattern appears to be leveraging external links for malicious purposes, potentially to distribute further malware or engage in phishing, rather than direct exploitation within the PDF itself.

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=jeff+conrad+car+chasers+died+in+o+re
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3929/3589/files/dixowamubujakaxaxadeju.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/39321374427.pdf
    • https://cdn.shopify.com/s/files/1/0435/8933/7256/files/hardest_riddles_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/zesosiwir.pdf
    • https://cdn.shopify.com/s/files/1/0437/5055/5799/files/wide_eyes_emoticon.pdf
    • https://cdn.shopify.com/s/files/1/0438/4561/5766/files/conic_sections_and_analytic_geometry_book.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbd68313aa79451b801647f1eb970551.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f73c7d0a84141f9b3453a32242d03eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_23dd7b715ab249a2b673114dd8402614.pdf
    • https://static.usrfiles.com/ugd/b8c837_e730f3607593427f837cf2bba1a66f37.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec98312f23d4465883f3d64519f1ab75.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7d526a8d92843e3980dc44cb9cb89af.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fc9513cd8a3429c960734aaf5d32b0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d345e268873f4e8cafee38c42d1886bc.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_off00006de6.bin
c895b7a4738d3f0174fc583d14acd30a7470258c5f14fabb6ca23cd5655e5ae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE6 5064 bytes
font_01_sfnt_off00007f0f.bin
b7897267f37915c88384cdf5ce2245690eafb8e1a1fef78c1b75e0dd1cadf6f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0F 10144 bytes

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