Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b672743884260a…

MALICIOUS

PDF

39.2 KB Created: 2020-08-10 03:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58ebc3f52a966c9f1ffe394a53ac284e SHA-1: 3312413f38feb51f9eb2305e47c50fe39c99cd8b SHA-256: 75b672743884260a655b32cf151a5b28d1ddd51fd169af8f39d0f854a061df1a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.ru/pify?keyword=actions+verbs+flashcards+pdf', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The document body itself is heavily obfuscated but contains references to the malicious URL and other PDF links.

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=actions+verbs+flashcards+pdf
    • http://files.granitemalamutes.com/uploads/1/3/0/7/130775071/3968365.pdf
    • http://files.lechandelierdor.com/uploads/1/3/1/4/131483371/6472944.pdf
    • http://files.tigerterrain.com/uploads/1/3/1/4/131407042/vujup-fexakanapoba-sogefori-komulu.pdf
    • http://files.mcdinteriors.co.uk/uploads/1/3/1/3/131380107/7730238.pdf
    • http://files.kickit4jdrf.org/uploads/1/3/2/6/132680974/nifupixa-jevovomem-zemusat-simaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/6146/8571/files/46063736106.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sujaxitedidubabupopivup.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/97442790845.pdf
    • https://cdn.shopify.com/s/files/1/0437/0235/4070/files/xobenarujujizurojusan.pdf
    • https://cdn.shopify.com/s/files/1/0431/5211/3820/files/37855950854.pdf
    • https://cdn.shopify.com/s/files/1/0447/3811/7781/files/guia_roji_carreteras_de_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0429/5609/5644/files/woledejuxitawopoliris.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/75244829015.pdf
    • https://cdn.shopify.com/s/files/1/0437/9839/7085/files/10886084845.pdf
    • https://cdn.shopify.com/s/files/1/0428/2050/1660/files/wisupebolojatawenaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4652/files/4517565596.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_off00004dee.bin
799ab95ffc4a47b77221bc89b08bc9722515b104c31e82a6c8e9d55c50246971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DEE 5220 bytes
font_01_sfnt_off00005f98.bin
78a67b9d3df9f11191f5739d488f6d57a906ce781bb6419215d466d1f37be574		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F98 9988 bytes
font_02_sfnt_off000081be.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81BE 4324 bytes

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