Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb077f5ab98463a…

MALICIOUS

PDF

36.5 KB Created: 2020-10-02 06:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5b08ddb971ecf07726631edc71e31218 SHA-1: 66f3c3211289ba7f10c357b2017497abe9853f91 SHA-256: dfb077f5ab98463acc26eaeda12bb06bb3bbc551bb7d68ddeb7405dc983d42dc
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=the+illustrated+encyclopedia+of+buddhist+wisdom`. The document body, though heavily obfuscated, also contains numerous URLs hosted on disposable domains, suggesting a link farm designed to funnel users to malicious sites. The ML classifier strongly flagged this PDF as malicious.

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=the+illustrated+encyclopedia+of+buddhist+wisdom In PDF document text
    • https://site-1038952.mozfiles.com/files/1038952/kufat.pdfIn PDF document text
    • https://site-1038482.mozfiles.com/files/1038482/464585833.pdfIn PDF document text
    • https://site-1037268.mozfiles.com/files/1037268/25960596869.pdfIn PDF document text
    • https://site-1038592.mozfiles.com/files/1038592/75417572531.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/gabefilonogisuzaliboxu.pdfIn PDF document text
    • https://site-1039869.mozfiles.com/files/1039869/22701844674.pdfIn PDF document text
    • https://site-1037141.mozfiles.com/files/1037141/jujigafutituwopoki.pdfIn PDF document text
    • http://zixumadux.thecabinetart.com/uploads/1/3/2/7/132740412/goneruvasimege-rozomofexigef-fimojov.pdfIn PDF document text
    • http://zufebufa.captaincillian.com/uploads/1/3/2/6/132682063/sexepolur.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/b20ac75d-5e44-419d-891e-d80a4e050063/sariwubidekotaropevujel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b68c28f-84cc-416e-ad5c-6f7f31262373/93592807132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc99146a-be99-4b2c-8860-1c394837535b/furiralebor.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_off00005091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5091 5676 bytes
SHA-256: 4a2999c4c0defdb9c17d98ea059531f3b2f984ee4d88c205b1e663f5e1ab2ac3
font_01_sfnt_off000063c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C7 9608 bytes
SHA-256: 522f1fdbb3e72ab6b14c9a01420147e667f711ba6d477ce517af2518083f452c

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