Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb4d4f0719a1835…

MALICIOUS

PDF

37.0 KB Created: 2020-10-02 08:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f467a86f79ae1f641b47aa312f24a217 SHA-1: db74bfb6ea01d3911689bfa0dfc7e8876885997a SHA-256: cfb4d4f0719a1835e0b12e101010a51a02387072f248634b87a62263008792cf
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs that lead to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains text related to streaming and the malicious URL itself, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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 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://ggtraff.ru/strik?keyword=la+passion+du+christ+streaming+hd In PDF document text
    • https://site-1036941.mozfiles.com/files/1036941/rutopupazikoxowesobub.pdfIn PDF document text
    • https://site-1038454.mozfiles.com/files/1038454/dajibumubeku.pdfIn PDF document text
    • https://site-1041613.mozfiles.com/files/1041613/losulazisijosukam.pdfIn PDF document text
    • http://files.4therochesterraiders.org/uploads/1/3/1/4/131437376/9507516.pdfIn PDF document text
    • http://files.barriehellyermotors.co.nz/uploads/1/3/2/7/132741029/3594139.pdfIn PDF document text
    • http://files.wvcoalfields.com/uploads/1/3/1/0/131070080/5840021.pdfIn PDF document text
    • http://vowovo.rickliva.com/uploads/1/3/2/7/132710621/nonumuragirixir.pdfIn PDF document text
    • http://files.storeofhopeministries.com/uploads/1/3/0/8/130813642/sogepirin-susajulezuduju.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/e744cf45-2555-4193-b83b-f4b523f09e79/dotipabuvigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee186360-5369-492f-847b-78f7eb98d5db/54395251958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aba534dc-047b-4fb1-acb3-b8f3f4e03a52/wozofogiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cfe8cb5-23ce-4a0b-bdbf-a1aa0713883d/99035932178.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_off0000507d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x507D 5396 bytes
SHA-256: d56b465428838677d20ab4c1a2e765e50d514b7a7e38ac0bf06b3240b2bbb176
font_01_sfnt_off000062ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62AC 10948 bytes
SHA-256: ce691faf7806e17e49890066101caf55eabba5504430048628d358e6251adff4

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