Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aad08f2fa74998d…

MALICIOUS

PDF

33.2 KB Created: 2020-11-07 10:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 81db70b486253b64657cac64607250d5 SHA-1: 3bd4ea728e822607b7ff117068d89d568f5cc075 SHA-256: 2aad08f2fa74998d8d4e2222a912701ea9f1a47982c49611384105d336c6e379
124 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which, 'Words with rescue', redirects to a known malicious URL (https://cctraff.ru/123?keyword=words+with+rescue). The document's structure and the presence of multiple links to disposable hosting suggest a link farm designed to lure users to malicious sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the ML classifier 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://cctraff.ru/123?keyword=words+with+rescue In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421205/normal_5f9fff7fc4b8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420612/normal_5f9fd9a895519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419629/normal_5f98a97454057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://minezonateta.files.wordpress.com/2020/11/39581500676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a0aa02-dfbf-4a4b-9181-427ee808de17/fudererewafogipup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d2e766-7ea9-4cc8-89d5-d8dce3d4a65f/55669960374.pdfIn PDF document text
    • https://levozenitaxi.files.wordpress.com/2020/11/cinema_paradiso_trumpet_sheet_music.pdfIn PDF document text
    • https://rebusudes.files.wordpress.com/2020/11/gulopaxavojikusonimaxusul.pdfIn PDF document text
    • https://gexevoj.files.wordpress.com/2020/11/mujijojidijewo.pdfIn PDF document text
    • https://kizajatisa.files.wordpress.com/2020/11/73733243449.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_off00004519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4519 4892 bytes
SHA-256: ff6fc08b37785e61a855fa770a2d1d23bd55b77f18790228a424a5c542a7eed7
font_01_sfnt_off000055ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55CE 10656 bytes
SHA-256: 4dc648cf26aa193cf017c1471d662bd3a74c328ff4fe0344ca714f07661f7485

Open this report in the interactive analyzer, or submit your own file for analysis.