Malicious PDF — malware analysis report

Static analysis result for SHA-256 239534f35dec2afb…

MALICIOUS

PDF

40.7 KB Created: 2020-10-07 01:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c3a945dab2da06b2117ee9c74d5c850d SHA-1: 668cd43eaf732dc9f6b512b7b07e7a7e60579c42 SHA-256: 239534f35dec2afbe7422e064e0d7061b5a9b0bd9d93b09829cac4ee3d025849
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ggtraff.ru/strik?keyword=west+pole+west+of+loathing In PDF document text
    • http://files.aurorasantiago-ortiz.com/uploads/1/3/2/6/132680860/5e358c7cc.pdfIn PDF document text
    • http://files.instinct-ready.com/uploads/1/3/2/6/132695351/6181002.pdfIn PDF document text
    • http://files.plymouthmusiclessons.com/uploads/1/3/0/7/130738572/f02fedaf1.pdfIn PDF document text
    • https://site-1043833.mozfiles.com/files/1043833/80702716967.pdfIn PDF document text
    • https://site-1037102.mozfiles.com/files/1037102/wutadetafon.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://uploads.strikinglycdn.com/files/1ce9ca45-ea6a-4e1c-9dc8-b0412ef06231/wodipedaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3ee5b2-bfa5-4926-aa93-f32251eaf728/gawebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03eefcb4-cba4-4358-bf8f-1990977085b5/12795100631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a878148-9a2b-4a7b-bbc8-01c6b7ef52b7/18311268821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b1780e-cfbf-4785-a859-3bd628655721/wujebabufududofosep.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_off00005412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5412 4960 bytes
SHA-256: 8256d9ce5cdee7f8fe17e4c8e5b936ffba3225555ebe963b17fcdc47b3205770
font_01_sfnt_off00006506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6506 10432 bytes
SHA-256: aa30d15740db56506c2847a804f699e8b2d807def61c27b0013af94ec6a7d6b3
font_02_sfnt_off00008872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8872 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378