Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4fd51feeee0088…

MALICIOUS

PDF

47.1 KB Created: 2020-11-03 22:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3c7ca96c3324796a5d771eee84f81d7e SHA-1: 8422b2f38dfe658cc37b0c384d027ad965822f6a SHA-256: 0a4fd51feeee008860cfb51c09daba03ee749ffceb93bad1eaa8d7fd2a30278a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://gettraff.ru/123?keyword=ghost+in+the+wires+pdf+free'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to this malicious site. 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=ghost+in+the+wires+pdf+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f953f26e72d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f87501e027ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/520d4567-e220-4658-809d-2059f5d3b6a7/watibukarupewalagaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0895/2992/files/turajefubexaganefuvek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d975ead1-7116-44b4-8575-553129f02777/xozadaveno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da85618-a830-4c16-b557-85dcf26b51e5/donezobomuniponabexaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be438b3-e0e7-4ae8-99a7-c72cffe7d1af/42853207194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7a3961-d463-43df-b75f-bab3ac0033bb/ruzexunomij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f90228f-b1c6-4608-9c15-6e18e8fdc970/37640974405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a5d2d6-8786-4d80-8bfa-f5a4ff10bb0d/elcomsoft_phone_breaker_registration_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/9715/0405/files/social_cognitive_learning_theory_and_autism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89947a69-9f94-4e2d-8315-92bd8f08ec9f/67339032280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f29ecc-37fd-4f49-9420-5dbd25aa66e6/15182862698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/771cfc4e-55f8-483f-a195-b367bc421c51/guia_de_consejo_tecnico_escolar_cuar.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78C1 5008 bytes
SHA-256: e24f959d00abe5b69126d6acbbf3c8d99dedc803fc910260b13774bcc3abc97c
font_01_sfnt_off000089db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DB 10916 bytes
SHA-256: a8a771559aeeffed33b2cb51520b136769f0b61b6e02fc1fda0197666a010ef3

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