Malicious PDF — malware analysis report

Static analysis result for SHA-256 7154911362bfea82…

MALICIOUS

PDF

42.1 KB Created: 2020-08-10 17:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 959b7a93b28b8b6b20bf11c52cdc36cc SHA-1: 0708c5ee8b45b1253ada0b99e2f18a46d0d313df SHA-256: 7154911362bfea820520e3ecb77168fc387f1f2f98fdcb2b2d4ff97c94234fb8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious content. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly indicated maliciousness.

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/pify?keyword=botany+neet+questions+pdf
    • http://files.firpoint.net/uploads/1/3/1/4/131453316/f0f617face9a21.pdf
    • http://files.tracethemitten.com/uploads/1/3/1/1/131164202/fujugusobofi_buvevedukitip.pdf
    • http://roxema.teatimeessentials.com/uploads/1/3/1/3/131398140/vuxemajanado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8014/5313/files/bokuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/47631127665.pdf
    • https://cdn.shopify.com/s/files/1/0432/2666/1023/files/the_business_school_robert_kiyosaki.pdf
    • https://cdn.shopify.com/s/files/1/0437/1975/3879/files/human_anatomy_drawing_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/28283621680.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/70355064272.pdf
    • https://cdn.shopify.com/s/files/1/0435/6322/1155/files/50_exercices_pour_avoir_confiance_en_soi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bamizubonofosexewa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7623/files/absorption_costing_formula.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/nevufanibojepozifa.pdf
    • https://cdn.shopify.com/s/files/1/0440/6103/2598/files/boxobuwajemudakuximonu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000522b.bin
73211736a8e275e17a8b5f0533685a2bfa4d42ad427c4e686631ed2ee9e7b934		 pdf-font-stream PDF embedded font (sfnt) at offset 0x522B 5184 bytes
font_01_sfnt_off000063ec.bin
23d36078004f0a12f1ff7117ca37f46ce935a97d7b0242ef34c986be14f7d676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EC 10084 bytes
font_02_sfnt_off000086ad.bin
b81bd6dad15da1d34caef1519340d18a34796ec70328335d7cf798cc40c487ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86AD 16096 bytes

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