Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9f6d1d9cf11363…

MALICIOUS

PDF

87.8 KB Created: 2020-10-01 12:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 146aea3fd3cc2981db5609a40bc575c0 SHA-1: eea3a37ed0de1029430630e8df069fe0a5e13af0 SHA-256: 3c9f6d1d9cf11363a601009fc26c25b30bec65bbb0296a0eae15bacea01b2eb6
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/strik?keyword=exercicio+de+analise+sintatica+pdf', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure the user to a malicious 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://cctraff.ru/strik?keyword=exercicio+de+analise+sintatica+pdf In PDF document text
    • https://site-1039505.mozfiles.com/files/1039505/93316204907.pdfIn PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/pesefujufin.pdfIn PDF document text
    • https://site-1037026.mozfiles.com/files/1037026/71825184611.pdfIn PDF document text
    • http://files.ieleaders.net/uploads/1/3/0/7/130776718/45c35ab516bd.pdfIn PDF document text
    • http://wamapatu.deep-learning-site.com/uploads/1/3/0/7/130740607/ropevidufuwaram.pdfIn PDF document text
    • http://jiruk.thogersenfamilyfarm.com/uploads/1/3/0/8/130814328/seweduwunakibo.pdfIn PDF document text
    • https://site-1039784.mozfiles.com/files/1039784/nemulu.pdfIn PDF document text
    • https://site-1036969.mozfiles.com/files/1036969/koliwapusosovijibumukep.pdfIn PDF document text
    • https://site-1038694.mozfiles.com/files/1038694/64830129282.pdfIn PDF document text
    • https://site-1037037.mozfiles.com/files/1037037/wukelabivusi.pdfIn PDF document text
    • https://site-1039148.mozfiles.com/files/1039148/84755416420.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/d42b1545-b981-4efc-9c2a-4f167e963696/solajarejize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9b083f-33d7-4677-8550-6db662c073af/kunufamerumumojatasijoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc80018-c5b2-44c7-8fbd-2fbca5e81afd/12548050268.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_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 5172 bytes
SHA-256: 19b8884fc014e890cc615830dd6d978ba88f57f390c3261ca38135dd4714ca5a
font_01_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 16816 bytes
SHA-256: b7690389cc2889fff7920c215c50946ef344fb2806a6dded3e11bdfbb34c22c7

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