Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fa02a9dae84e62…

MALICIOUS

PDF

124.5 KB Created: 2020-11-02 18:32:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1b9fa46df674118624df2d3a0ae28250 SHA-1: 5d46096f7c3efca6b7a5cfbfab58280433c8354c SHA-256: 85fa02a9dae84e62fb7333983053de46474f1fc73e25afaf1e1eacd4a9dc3277
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to `ttraff.ru`, identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to an 'owners manual' and the malicious URL, suggesting a lure for phishing or malware delivery. The heuristic `PDF_MALICIOUS_REDIRECTOR_LINK` confirms the malicious nature of the embedded URL.

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 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.
  • 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://ttraff.ru/123?keyword=owners+manual+2005+starcraft In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5f91de68e0ac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f8ce7ee2a7d2.pdfIn PDF document text
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/jinakapurepe.pdfIn PDF document text
    • https://purusoze.weebly.com/uploads/1/3/4/4/134495244/1202068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5f932dbba1b6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5f8c89af7b2fb.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/virexi-dilugikufogamo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/6664315338.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/zugezowatam.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/46013017630.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/36260849913.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/93398063906.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19230 5544 bytes
SHA-256: 8dd07131876f2db252b4149559962527230a0ae9f5543decebeef9ca31240cb8
font_01_sfnt_off0001a506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A506 12276 bytes
SHA-256: b35071e72f016e428168e9d135eea5a05656d825a4cd174e240b100cfe542f05
font_02_sfnt_off0001cee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEE7 16120 bytes
SHA-256: 1b6e3a12d83a6b91de14f0823b9740a7ee83c879122ff823c4f04356cea2c199

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