Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf0295f269dea55…

MALICIOUS

PDF

42.3 KB Created: 2020-10-06 23:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3e88a3de5a7ab03be01602a37cf389c8 SHA-1: cd61260fd49046acb7fb821124e2fcef46574a20 SHA-256: 2cf0295f269dea5573b2677b3e260460488eef12b71ff5927427dda50f904769
184 Risk Score

Malware Insights

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

The sample is a PDF document that functions as a link farm, containing numerous embedded URLs. One URL, 'https://gettraff.ru/strik?keyword=gliomas+del+tallo+cerebral+pdf', is flagged as a malicious redirector. The document's structure and the presence of many links hosted on disposable or SEO-focused platforms suggest an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the overall pattern indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gettraff.ru/strik?keyword=gliomas+del+tallo+cerebral+pdf In PDF document text
    • https://site-1037894.mozfiles.com/files/1037894/tosirob.pdfIn PDF document text
    • https://site-1036861.mozfiles.com/files/1036861/najebaridumabupupaxurexi.pdfIn PDF document text
    • https://site-1039490.mozfiles.com/files/1039490/venozozujadi.pdfIn PDF document text
    • https://site-1036676.mozfiles.com/files/1036676/90273638559.pdfIn PDF document text
    • https://site-1037253.mozfiles.com/files/1037253/telenepulububevizurode.pdfIn PDF document text
    • http://files.be-brave.shop/uploads/1/3/0/7/130740173/3b7eddc7e45af1.pdfIn PDF document text
    • http://files.marzipan-media.com/uploads/1/3/1/8/131856184/7584706.pdfIn PDF document text
    • http://files.heartofachildministries.org/uploads/1/3/2/7/132712447/e7a59137c8ce5a.pdfIn PDF document text
    • http://files.jansceramic.com/uploads/1/3/1/4/131407763/kidutamunawi.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/b536344a-7487-4f27-8054-341c19588900/22743784027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c8a14f-f79f-4a99-8213-371af02756d5/zijopumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0688cbb9-0e8d-4f5f-accb-33ac960a4311/mukukuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c109d63-c3b6-4ae7-bc0d-1bab2659620d/23348249213.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_off000067ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AE 5472 bytes
SHA-256: 836073e542da8af64fd92eff336ae17eac9800960d709d016fec0ce11999ca65
font_01_sfnt_off00007a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2D 10108 bytes
SHA-256: ece3955ba10144e4fbaa5bbafba862dbd68364be1e9b14d906350b2dcc848c8e

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