Malicious PDF — malware analysis report

Static analysis result for SHA-256 4faf04b1e28df94c…

MALICIOUS

PDF

32.2 KB Created: 2020-11-01 16:28:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e623e71254442b3348be5f7e6c06a2b2 SHA-1: 939e9edc41e766b93003d845cedc79e47f3bab38 SHA-256: 4faf04b1e28df94c4a7f68222087c6a185689e991b065cfe3193203464236abd
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=todays+class+answers In PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/3417bd266854c.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/4a7ca0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f8740cb9fa82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/showboat_drive_in_theater.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3432/8219/files/letter_writing_samples_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/active_causative_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/agricoltura_biodinamica.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/iptv_reviews_uk_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/hernias_umbilicales_en_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04f8259-c551-4955-a139-7d64b2a7de08/80545730366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7cd1c8d-c323-4522-956f-d34008509552/57023341356.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0865/4492/files/99403588920.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1802/6140/files/accounting_equation_worksheet_excel.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000434a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x434A 5076 bytes
SHA-256: b11a98d8806b6b3cff7b9bcb9f5da8296a7753b74f77464144d98641a57462e8
font_01_sfnt_off000054b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54B2 9472 bytes
SHA-256: 52c58847d644cf48ec9e130c1917ac2d36041de4595db063f899ffb3d2b1ebfc

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