Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8b7803574a5800…

MALICIOUS

PDF

42.9 KB Created: 2020-11-09 13:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 02a12ba7ff2c7067888382eac6d4cc09 SHA-1: 1ba72519993d3f2e64ba2e4524030d103dd02588 SHA-256: ab8b7803574a5800c63b789c47ecef80654d5d69a4e5bc760633c660ab6c363c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, many pointing to disposable hosting or redirectors, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that the document is designed to direct users to harmful websites.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?keyword=restraint+system+definition In PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/3298954.pdfIn PDF document text
    • https://wogijelagorezu.weebly.com/uploads/1/3/4/0/134096035/b312d4b79450cc9.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/dcad36586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5f91c5a106ab9.pdfIn PDF document text
    • https://dekekutema.weebly.com/uploads/1/3/4/4/134440935/takupewafowidowab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_5f9959c7047b1.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/munaziruzaxuw-wowomulurodi.pdfIn PDF document text
    • https://winuvepesedop.weebly.com/uploads/1/3/4/4/134476249/bovono-toxaxerimij-nozus.pdfIn PDF document text
    • https://roxomutina.weebly.com/uploads/1/3/4/6/134663133/suwotixisuna.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/dukexajuj/zowasisaxapizedepepaz.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/lidelifusoligejoz.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/16141612684.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_off000067ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AC 5128 bytes
SHA-256: 87117992c4d65eb78636ce50bf338a9352b5a6414071549227e7e589c25c6ac0
font_01_sfnt_off00007914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7914 11024 bytes
SHA-256: 8dd39235a472d6f412435565c77861e7a038c81fed420b51dfdc60a438a976fa

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