Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9439898ef8d39f2…

MALICIOUS

PDF

35.8 KB Created: 2020-08-21 21:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: befe5b04b5abe2e4825579dcf2c1c6e0 SHA-1: be0c012c3bb613cb037a48eb7ed4460da0ccc045 SHA-256: c9439898ef8d39f251d0729af47852bdba35a6116a166a3431373d03ade0078a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=divorce+petition+form+pdf'. This indicates the document's primary purpose is to trick users into visiting a malicious URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=divorce+petition+form+pdf
    • http://tugizonev.interactivedrawingtherapy.org/uploads/1/3/2/7/132711991/3274786.pdf
    • http://lizim.hoopsnakegraphics.com/uploads/1/3/1/3/131398140/jigusapopasita.pdf
    • http://files.newtonwonder.net/uploads/1/3/1/1/131164168/0f4dd639f8b50.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6908/files/jevigakuwazegikatiwuwiziv.pdf
    • https://cdn.shopify.com/s/files/1/0448/5660/6881/files/angulos_geometria_plana.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/darofitosuviniweza.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/41195329009.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/tv_guide_syracuse_ny.pdf
    • https://cdn.shopify.com/s/files/1/0445/6588/9188/files/bpsc_mains_question_paper_of_maths.pdf
    • https://cdn.shopify.com/s/files/1/0434/0691/7799/files/39951037087.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7815/files/selilajulemu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4336/files/open_file_in_browser_java.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f77.bin
9e749d3f9f1636fc8f97c5e4766a6fe4c3500aadce1deb2a9cd0f8a07d2f6c16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F77 4940 bytes
font_01_sfnt_off00006038.bin
6b82c5be724aa04a3f41e44fc866b8843df7a3028671149d38b994700004f914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6038 10032 bytes

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