Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4967c0ed1e9a6a…

MALICIOUS

PDF

43.7 KB Created: 2020-10-03 22:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e8c0b92a2a0846c58bf05138ed04608 SHA-1: 5b53ad5a6d59efd2b9092daa906bead7038b1cd9 SHA-256: 8c4967c0ed1e9a6acf6eb1be79a40d65fa4e0b46474a5bf8065d3c39544087ef
124 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=centurion+magazine+pdf'. Additional heuristics indicate the PDF is a link farm on disposable hosting. While the document body is heavily obfuscated, the presence of embedded URLs and the redirector link strongly suggest an attempt to lead the user to a malicious site. No scripts were extracted, but the overall structure and link behavior are indicative of a phishing or malware delivery attempt.

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://cctraff.ru/strik?keyword=centurion+magazine+pdf In PDF document text
    • https://site-1036632.mozfiles.com/files/1036632/rekidagojibeji.pdfIn PDF document text
    • https://site-1036852.mozfiles.com/files/1036852/36206717856.pdfIn PDF document text
    • https://site-1038981.mozfiles.com/files/1038981/1238057875.pdfIn PDF document text
    • https://site-1037870.mozfiles.com/files/1037870/34403938687.pdfIn PDF document text
    • https://site-1038844.mozfiles.com/files/1038844/siwukavesogusisudoz.pdfIn PDF document text
    • https://site-1036761.mozfiles.com/files/1036761/likorofozitalumodiwavile.pdfIn PDF document text
    • https://site-1038338.mozfiles.com/files/1038338/taxixorajaveket.pdfIn PDF document text
    • https://site-1042635.mozfiles.com/files/1042635/31198553379.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5550/4794/files/67456934038.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7013/6220/files/30742769935.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5385/5132/files/honeywell_thermostat_rth6350_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17988674-7a0c-4558-ba4d-d0db1ec169b7/29548556797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc713856-aac1-46c6-9702-3cbee9d21747/verulijakujepafimurelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12251e0-c90f-4fc0-8f89-d2d44e20e2e5/47676427690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca2e3cd-2360-4794-89c8-38471939d396/70343339639.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_off00006c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C72 5104 bytes
SHA-256: 7947c3e436efdeba7ddf837ecaa9225088c13b6747d3d9d200ac3f20674e0223
font_01_sfnt_off00007dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBD 11072 bytes
SHA-256: 511b0f73ca86b9364cc92ab916cbb1fd69ef832b86bdb267b642d96375e40f49

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