Malicious PDF — malware analysis report

Static analysis result for SHA-256 647c460b633dc697…

MALICIOUS

PDF

37.9 KB Created: 2020-09-02 01:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e76c4c832c8546f37800ee6e7d2ffe3 SHA-1: d2ad8d9e5ecb2cd048f7dc3a01696b19e31b65ae SHA-256: 647c460b633dc697439af11e9582cbfbdb8a647d1aa7b4596b6184f69e2c4eb0
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a cheat code guide, which redirects to a known malicious URL. The document also exhibits characteristics of a link farm, with numerous embedded links pointing to external PDF files. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious infrastructure.

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=cheat+codes+for+asphalt+nitro+android+game
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/db1da1_fd59e18f905b4d3c8c17630ef1d3f86c.pdf
    • https://static.usrfiles.com/ugd/cafc24_f9a4759ba4084e528acac039a410ff45.pdf
    • https://static.usrfiles.com/ugd/b8c837_63fa5c06e79e4155b579388d06b9f5f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c40a06dee65b4ebbbabd8150b28c8d04.pdf
    • https://static.usrfiles.com/ugd/cc03df_2ab25feb55d043c98b006d27081473af.pdf
    • https://static.usrfiles.com/ugd/3aee12_06d204234ed648dcaa0844d7e3ae6b8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b01fce332ca45c4a411548e81fdf31c.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_f7d591e7a00543b9a2f7f3d844d6e38e.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3851/files/animal_farm_a_study_guide_students_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/frigidaire_ultra_quiet_iii.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_off0000565c.bin
689f8bb0b80b7d20b27eb7d8d1874687d1e34d11562def3721c743fc32fe1ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x565C 5476 bytes
font_01_sfnt_off000068cb.bin
82c81e38ce97d08841638f4d83b3c632bb0cdf167b360922b274c44a3003c7c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CB 10100 bytes

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