Malicious PDF — malware analysis report

Static analysis result for SHA-256 665d5320aa605286…

MALICIOUS

PDF

41.7 KB Created: 2020-08-11 03:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6af7995c4de7e06447e41e28559cba48 SHA-1: 9b4e07e6877b28268b24d375fc5617955af520e1 SHA-256: 665d5320aa60528611deb7de46c15874f21651ad4b99b8bec2148a3c65769046
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=vested+interest+and+contingent+interest+pdf'. The document body also contains this URL along with numerous other links to PDF files hosted on Shopify and other domains, suggesting a link farm or a method to obscure the true malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=vested+interest+and+contingent+interest+pdf
    • http://files.thefairyhostel.com/uploads/1/3/0/9/130969855/zanodixa.pdf
    • http://files.abovetumblerridge.ca/uploads/1/3/0/7/130775032/5768229.pdf
    • http://sujexize.regantempleton.com/uploads/1/3/2/6/132681352/punapirifiluxu.pdf
    • http://files.vealsphotography.com/uploads/1/3/1/3/131383953/fibogegiradat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4717/4822/files/64183789900.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/69667104773.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/3d_animation_software.pdf
    • https://cdn.shopify.com/s/files/1/0434/7222/4421/files/38409830882.pdf
    • https://cdn.shopify.com/s/files/1/0430/7605/9290/files/nijemozu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/xetumuporipidozerof.pdf
    • https://cdn.shopify.com/s/files/1/0454/0537/2584/files/50996322874.pdf
    • https://cdn.shopify.com/s/files/1/0428/6581/9814/files/86996171540.pdf
    • https://cdn.shopify.com/s/files/1/0440/6712/7446/files/fokagamopitesuwamexumiwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5371/9452/files/8362479580.pdf
    • https://cdn.shopify.com/s/files/1/0437/0949/7496/files/16959080617.pdf
    • https://cdn.shopify.com/s/files/1/0443/6430/0444/files/41606692730.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/3840552037.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_off00006539.bin
9e46ad31b7bc4551b7b9bd18d25bf975e7b36db37493e1d6a188f000302844b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6539 5256 bytes
font_01_sfnt_off00007725.bin
390df6b4aa1f7e98e40ed5ffc68fb607c4c6461af93ffc22e1ab8828f8c6c24f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7725 9956 bytes

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