Malicious PDF — malware analysis report

Static analysis result for SHA-256 941d2ca0cb7f2159…

MALICIOUS

PDF

40.3 KB Created: 2020-11-02 04:25:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: f0c4b27a8adfaf90dce8ddcf1c665695 SHA-1: b26446ef48d819776538930e51f49f5674d229d5 SHA-256: 941d2ca0cb7f21597dcbdc0f96f079e6df66a894da0a7500d2ad0c6f981d20eb
214 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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) or Microsoft license-boilerplate 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=descargar+spotify+para+pc+gratis+uptodown In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5f9095bb28b31.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/fe7733c6-9081-4799-8eb8-3de392ff0b80/crafting_feats_pathfinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6199707a-5f8e-4ccd-9263-e01c421e627b/rozarukuso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1826/3448/files/88592285061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba52f97-484f-4705-852d-66af2051fe27/26550991419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb11bde-3e89-4a67-960e-cdc4c91a9b18/57154543069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/381128b8-3024-499e-a9c7-cbb6eb423fc7/saints_row_1_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9679454-308f-4f07-94d5-40fafcbca89e/47017097361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c7042a3-51ab-4e11-9327-fbfbe2f85549/giguwarufox.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/wixonofejir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2bfbf3-033b-4801-9f35-34b3f5ea5ab0/22915602320.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8896/4503/files/15699132407.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/david_raynor_hillary_clinton.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_off00005d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D33 5484 bytes
SHA-256: 8821d54055a64f150a3623096e967a9123dd5fcc7ab7112d3e8a7846a952c529
font_01_sfnt_off0000700a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x700A 10420 bytes
SHA-256: ea85deacb6fdd4fea3d52f3f0a82e7138386330eb0155d669add42459365c018

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