Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c4e9667e97633f…

MALICIOUS

PDF

74.5 KB Created: 2020-11-01 17:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 775a9e5d4fab6e5afadfa0bdc6a0028a SHA-1: c6e8f010ec74211b50e7f6b6155ace0e93a06240 SHA-256: 85c4e9667e97633f760e109db5373361f2d687a741d19a7d6d3d4c44cb542420
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to bird pictures and the malicious URL, suggesting a lure. The presence of a large number of external links, many pointing to benign Shopify URLs, indicates a potential SEO link farm used to disguise malicious activity.

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://cctraff.ru/123?keyword=types+of+black+birds+pictures In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f88c95eab0a4.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/1/0501/1783/6965/files/xevonavinewurozazog.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/americas_first_daughter_book_club_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91258e4d-42dd-448d-b142-0d5a49f1fcd4/mojewobisepa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/3258/4607/files/37994867791.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4582/1855/files/hp_virtual_connect_manager_user_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6858/2809/files/vizio_e701i-a3_t_con_board.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6448/1693/files/ice_cube_on_burger_youtube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1568/3743/files/kitatizizarotipoza.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/28535715093.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_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 5180 bytes
SHA-256: 560a18ff6b5a86f0b56a5d2ce5b44dc6c35ee277a1d457725dac79399a295f05
font_01_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 10932 bytes
SHA-256: 831f5f5203ecb5556a52c11dc85505037206fcdc223505ccf53d7e9d69ca0434
font_02_sfnt_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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