Malicious PDF — malware analysis report

Static analysis result for SHA-256 98874e7ea2e5f829…

MALICIOUS

PDF

60.2 KB Created: 2020-11-09 06:56:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c67464be34842856d930f79ce228ead SHA-1: 77d420d88ffd1aa25a5a7106ee932c8c2f2c4fb4 SHA-256: 98874e7ea2e5f829da89d035504391cde47a382d583d98d44ed62a883e55624a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. One prominent URL, 'https://traffnew.ru/123?keyword=all+similar+polygons+are+congruent', is directly embedded and flagged as suspicious. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?keyword=all+similar+polygons+are+congruent
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f9f7a604c6ff.pdf
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5fa389e1ecf64.pdf
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5f912fd211e9d.pdf
    • https://cdn-cms.f-static.net/uploads/4410714/normal_5f984e57eeffb.pdf
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5f8dd4743f4f3.pdf
    • https://cdn-cms.f-static.net/uploads/4380379/normal_5f8e3eda9eb65.pdf
    • https://cdn-cms.f-static.net/uploads/4374362/normal_5f8e44c054faa.pdf
    • https://cdn-cms.f-static.net/uploads/4404524/normal_5f96bb67b1464.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/58fb6c31-313c-4bdf-af81-14f99dc4f030/58024714370.pdf
    • https://vamudud.files.wordpress.com/2020/11/bewise_classes_notes.pdf
    • https://rewuvulolodu.files.wordpress.com/2020/11/sifevatefigojogoniro.pdf
    • https://s3.amazonaws.com/jaxesabi/ontario_knife_company.pdf
    • https://tabubiselo.files.wordpress.com/2020/11/linear_equations_worksheet_with_fractions.pdf
    • https://konomalipu.files.wordpress.com/2020/11/4245735901.pdf
    • https://saridejawe.files.wordpress.com/2020/11/dagujafadupidarekef.pdf
    • https://s3.amazonaws.com/naxizugenabi/55810633601.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000799b.bin
7732f78f0e4cab1e7cbf157785e9845e6f2db24dbb24c03fe8ffe8ba695fd90d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x799B 5344 bytes
font_01_sfnt_off00008bb6.bin
1449897c73ea57c04739b29c330f7cbbe245efc78a665bd9467e49b79233b597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB6 6920 bytes
font_02_sfnt_off0000a383.bin
6aba880e8a351ea2345e090dcbba77c407de36348dfe52a27711de23bd7b9278		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA383 12372 bytes
font_03_sfnt_off0000ccc4.bin
a8f82ce1cdc57d6cf73caeb35ba0a534b8f114798d4dfc5d6ed82df03316e49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC4 16384 bytes

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