Malicious PDF — malware analysis report

Static analysis result for SHA-256 087af936f86bef52…

MALICIOUS

PDF

43.0 KB Created: 2020-09-01 21:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9f180a7d43179ec8b20f5b95202673b SHA-1: 55144c611f0cdf7cb10820d0bc6a8d2f9b5cb1ef SHA-256: 087af936f86bef52b1bb3d61084f93631060e909d25e4698f249c3df05d932f5
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=game+wala+game++karo'. It also exhibits characteristics of a PDF link farm, with numerous embedded links to Shopify-hosted PDFs. The document body, though heavily obfuscated, contains the same malicious URL and benign-looking PDF filenames, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the presence of embedded URLs and the redirector heuristic strongly indicate a phishing or redirection attempt.

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/wix?keyword=game+wala+game++karo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0435/6558/0449/files/skeptic_feminist_murder.pdf
    • https://cdn.shopify.com/s/files/1/0433/7745/9363/files/courier_post_tracking_number_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/9583/4280/files/hadith_bukhari_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0435/3140/3413/files/postal_exam_473e_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/93176145896.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fasexerogetotano.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5708/files/clinical_practice_guidelines_gestational_diabetes_mellitus_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0438/5010/4982/files/texududobujenevuwewogog.pdf
    • https://cdn.shopify.com/s/files/1/0429/4901/7756/files/66758191599.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/sanofatinivutukal.pdf
    • https://cdn.shopify.com/s/files/1/0434/4266/7676/files/ragoguvinetuzubipeti.pdf
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/palefise.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea29acf860ad4b81bda596425837867b.pdf
    • https://static.usrfiles.com/ugd/8b4172_b7979cc428d04121a20923645e8c5568.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_aff2f704c40c41d28c77880a83b58f9b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005efc.bin
77e16c1e7207794f1c1636a69471a1bdda0e5daa0227e3f9c77419d6dee95051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFC 5012 bytes
font_01_sfnt_off0000700a.bin
860d058b4239d8bf3eefdaa5d09c0eeba89ba53e0977d607f25857dce2bad3b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x700A 9924 bytes
font_02_sfnt_off0000923d.bin
b3b3c2bc4ebb853de729926234676046ac2433cb548cb277f7d2c37d9682b2c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x923D 3276 bytes

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