Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9918a75dc5ae9d5…

MALICIOUS

PDF

50.2 KB Created: 2020-11-05 06:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: df3142a4ba5e1a2c4b8ae894d3a1d28a SHA-1: da00eae078c0e49c63ee478bda8eb14ce1e9dd49 SHA-256: b9918a75dc5ae9d5e7111bcd8d27fe05e618057666a912a3748d51cf50ada264
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and 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.
  • 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/strik?keyword=oster+convection+countertop+oven+manual+print In PDF document text
    • https://nonuvatemex.weebly.com/uploads/1/3/4/4/134443968/tukatawuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5f93dc8d55973.pdfIn PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/zisam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_5fa1eab18a170.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/1c94224b-3597-4e2e-9435-55ff305258b8/is_academy_awards_capitalized.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c479419-2bf7-49b3-919c-759e8ba82dfb/32235760168.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7284/5490/files/whynter_arc_14sh_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7313/4492/files/dunobokapozarojasunidifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b428fa-d1a1-4faf-a0a2-1a23aa3b6d81/98861129321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df7bd912-29af-4a3c-8519-30d6a52f5c0b/electron_configuration_webquest_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27f8676-cb9d-4e95-b334-79ecd2ac8e44/truchas_de_batata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdb7dbc-3475-4e63-b684-efd8fe1eeed2/john_c_fremont_days_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cbca8fe-34b9-41c7-9c6d-fe070a1e935f/pejosonidubazesojisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/836d32ad-f271-4d14-be51-f188dcc412d0/fufawanopapagegex.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_off00007867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7867 5048 bytes
SHA-256: 8ab7e2b39c160cca85bf5748e0ceccc07f24384da0f445f61c7f2c3271b3e58f
font_01_sfnt_off00008976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8976 10544 bytes
SHA-256: 6f5e8c2cd111c3080bdf6a75f1a16c592c9a57afca323354d6c6154b80b82a11
font_02_sfnt_off0000ad70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD70 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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