Malicious PDF — malware analysis report

Static analysis result for SHA-256 9612a3470d40042b…

MALICIOUS

PDF

35.6 KB Created: 2020-10-12 05:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 26921fdd1ed52f8582a033f2acd46080 SHA-1: 72e67c8d48623d01fb465dbdd4a7905c9c379193 SHA-256: 9612a3470d40042b752f498e306c926adfac110fbdc13e0a3811a50129e39dba
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious sites. No scripts were extracted, but the presence of multiple links to potentially disposable hosting suggests a phishing or malware distribution 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=menu+tu+leja+kite+dur+song In PDF document text
    • http://nafanax.flykingzcollection.com/uploads/1/3/1/4/131482995/jikebunojavowo.pdfIn PDF document text
    • http://fozesi.pitchpausepace.com.au/uploads/1/3/2/6/132682646/8e486a79b.pdfIn PDF document text
    • http://files.loveandmercyfdc.com/uploads/1/3/1/8/131857071/tazowirujuvimi.pdfIn PDF document text
    • https://site-1042770.mozfiles.com/files/1042770/3192107951.pdfIn PDF document text
    • https://site-1038779.mozfiles.com/files/1038779/lubom.pdfIn PDF document text
    • https://site-1039852.mozfiles.com/files/1039852/wawawa.pdfIn PDF document text
    • https://site-1044066.mozfiles.com/files/1044066/najeritowofadosow.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/4430eef5-f25b-43fd-bb45-c01f28edf204/17339465481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6efe464-00b1-4589-ad32-2addc6e327ed/9999712381.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_off00004c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C54 5140 bytes
SHA-256: 4434a16f6fe645d513e61a056fc4022d785e169e43e78b87898dd4ad2e7ef8af
font_01_sfnt_off00005deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEB 11096 bytes
SHA-256: 2bfd173bf405cd47f9ec546a5fd1137472fdac507edd0035a31ecd1440124b38

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