Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b3a695a9d0d539…

MALICIOUS

PDF

46.9 KB Created: 2020-08-05 04:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1fcbffb9d1a02a35b6ec9078196aca1 SHA-1: 2460663ad5fa0512d2bdacbdb47ea08b0f91d624 SHA-256: 63b3a695a9d0d53920807d066e45dcaaad9d60bf642c3384453a2b9dc484237a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to redirect users to potentially malicious content, masquerading as a download for a popular textbook. The primary malicious URL identified is a redirector, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

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.com/pify?keyword=biochemistry+by+lehninger+pdf+free+download
    • http://files.aliciaallenphotography.com/uploads/1/3/1/4/131408928/301e4.pdf
    • http://files.crossfit-galveston.com/uploads/1/3/1/6/131607522/xufufarodeg-beraxapuxojebef-murudojivubifa.pdf
    • http://files.bishopgumbleton.com/uploads/1/3/1/3/131379371/tokasinipegog.pdf
    • http://files.boulevardathens.com/uploads/1/3/2/6/132682640/9346233.pdf
    • http://files.teachergoals.org/uploads/1/3/1/3/131378993/fceacbc3091.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/bepantol_pomada_bula.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9293/files/memupipemejoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6980/0597/files/1820783541.pdf
    • https://cdn.shopify.com/s/files/1/0432/7083/2283/files/54506894118.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/nubavomo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/23874922990.pdf
    • https://cdn.shopify.com/s/files/1/0438/5990/2624/files/the_new_encyclopedia_of_modern_bodybuilding_francais.pdf
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/nejumatot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065a6.bin
feac2890d66c9c537e55711bfd561919c51fef82ab23cb06ddbb342a2082b988		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A6 4416 bytes
font_01_sfnt_off0000753a.bin
891fc7ab4aef8ac99d7c55546a254c5d4923183ecff1f0405f927e9c25f3493a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753A 5952 bytes
font_02_sfnt_off00008968.bin
410473ca7e3d0dc0c68d8dc8dfe60765c3f9394cbf81d2dd19e7597dc028bdd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8968 10656 bytes

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