Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b4471a4e405681…

MALICIOUS

PDF

47.2 KB Created: 2020-11-06 22:16:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7bc5267ba2111f19a1874fda95648148 SHA-1: d38af2dc9ce68d2b05f3baaade51b3c3c64a2923 SHA-256: f3b4471a4e405681092715468a696f213339bcdd02f8fe91a6a0463ed38556d2
114 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=getmyoffer+capitalone+com+login In PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_5f9109dab8447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_5f9d14a2e8aa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_5fa3f10f3a903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_5f98d9c8c5468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5f8cfd31b366a.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/cfc906dd-bde5-4ec7-a9ad-55bf79956de4/givemiresutarijiforos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e892bd5e-7488-451c-9ccb-cb87257ca499/dope_war_crack_house_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd24282-d052-48c1-a997-70518b6cc66a/94781718068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b9cf48-466a-430d-ac16-9f2ea77e36c7/sportcraft_electronic_dartboard_inst.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a482aea5-ac35-428b-aa83-8204daba4ab5/wojawoxinavabibeboze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63671680-a253-4399-9d8b-95d7682d69f1/motilafegibol.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/astm_a53_b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7016e5-e761-46de-bb82-2e352fc09330/acer_v3_575t_51q8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58b4c66-c6b0-4a8a-94c7-083707da96f9/cal_osha_pocket_guide_for_the_construction_industry_2015.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_off00007780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7780 5288 bytes
SHA-256: b03a4bc43f5cfb6979649c1114fc9f97a1784ccca08161fc4f6a3a28ba9d4b8a
font_01_sfnt_off00008980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8980 11280 bytes
SHA-256: 3331d4423a0eaeb0c2861fc866f3b23b29ef07eae68acb01a6324f65bc347c7d

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