Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48cf8b2c9e2928b…

MALICIOUS

PDF

48.2 KB Created: 2020-10-28 17:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d6253a6afcd02cc1716a3740b0f7313e SHA-1: 804179c542e721aafceb5f29788bdd49116bdeb3 SHA-256: b48cf8b2c9e2928b898d78df3cb65717bcc258633808981ff1b69df6d8119d3c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed to obscure malicious redirects. One such link, https://gettraff.ru/123?keyword=bluets+maggie+nelson+pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/123?keyword=bluets+maggie+nelson+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_5f994f2088b1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5f8fd1e9bcc67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6245/5191/files/the_rock_in_high_school_fat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6abfe95b-d526-489d-9010-0affd912d395/pedex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7195/7911/files/breakaway_deck_plan_14.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8929/2184/files/minuet_in_g_beethoven_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0200/3108/files/international_accounting_a_user_perspective_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3f888b-43cd-48a2-a48c-5df23636da16/83739222624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eecd52c-9c88-4b6c-804f-a66f7f2a4c62/79059370268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/95414483465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7119/9163/files/nature_republic_foot_peeling_mask_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3368/7750/files/ximudoxawabaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/581965a6-75e8-43b6-8de7-9bde46fa3147/resiwojiwegagamebat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6310/7480/files/kexuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1d304e-33a3-4bde-bc8c-949bfdd58924/26791656879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2626/7291/files/pepexibawarim.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70BE 5196 bytes
SHA-256: 06b8e024932b1f5934b92e2d9f7adfc5266c2f264076f2e2874db11ad6022c97
font_01_sfnt_off00008255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8255 10544 bytes
SHA-256: feae1b33be2cdd707ad1c9c48e816e75fedf25afb83fcf71faeabaacf60345cf
font_02_sfnt_off0000a5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5EB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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