Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d0a52c4664532f8…

MALICIOUS

PDF

34.9 KB Created: 2020-11-02 16:11:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15aa9f8ed8d9549fe644298bc4c1ebad SHA-1: 8030ff4da541d14e4c1a13716b4573e34124f039 SHA-256: 3d0a52c4664532f8dda40a9689f7fbcea8e99bb318ef0d80c6f08e8d37dc677c
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector URL, 'https://gettraff.ru/strik?keyword=a+pdf+key'. This heuristic, combined with a high ML classifier score, indicates a malicious intent to lure the user to a harmful site. The document body itself is heavily obfuscated and contains embedded URLs, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=a+pdf+key
    • https://cdn-cms.f-static.net/uploads/4394068/normal_5f90977e724f5.pdf
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f8ca2ca3279f.pdf
    • https://cdn-cms.f-static.net/uploads/4422161/normal_5f9a3de55dd47.pdf
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5f929151f1a10.pdf
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/gewenibusifumoz-vulukevemeb.pdf
    • https://cdn-cms.f-static.net/uploads/4424043/normal_5f977939ed5b7.pdf
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f9860ba316e7.pdf
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f87f28c4b668.pdf
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/liwopojir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0504/6986/3584/files/focus_st_mud_flap_bracket.pdf
    • https://uploads.strikinglycdn.com/files/b2af209e-3b56-4f2b-aca4-41be7c126458/berosatafokok.pdf
    • https://uploads.strikinglycdn.com/files/d2dfd01c-b556-4d11-b043-e663a1705ead/23916165961.pdf
    • https://cdn.shopify.com/s/files/1/0500/3349/2154/files/meningitis_tratamiento_2020.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c1d.bin
edbb8d4ae656d3516489849504f8ca7e5422da9188eace5ce6429a76205df990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C1D 4672 bytes
font_01_sfnt_off00005c2d.bin
a3791db117545045d3ea496eef2c26ca758a35de61d6400205695c145e901e26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2D 10568 bytes

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