Malicious PDF — malware analysis report

Static analysis result for SHA-256 63da52989f2dfa87…

MALICIOUS

PDF

41.0 KB Created: 2020-08-03 22:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23637bba0bdec4a36f6ab479fd070389 SHA-1: e3da7bfb7fda330a62490ba499cdf25deda39346 SHA-256: 63da52989f2dfa8758cc2934d5ec51fd2ecf51ef4d9eacf83dabcd1aa69eac85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically at https://ttraff.ru/wb?keyword=converting%20pdf%20to%20word%20for%20free%20online. Additionally, it features a large number of external PDF links, many of which are benign Shopify URLs, suggesting a link farm or SEO manipulation tactic. 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/wb?keyword=converting%20pdf%20to%20word%20for%20free%20online
    • http://files.farmshoppe.ca/uploads/1/3/1/6/131606193/4808691.pdf
    • http://files.kingstonchamberchoir.ca/uploads/1/3/1/4/131453536/36a41c268a.pdf
    • http://files.kaimarafghans.com/uploads/1/3/1/3/131380299/8645448.pdf
    • http://files.shop8borders.com/uploads/1/3/0/8/130813782/jewololiberagonotot.pdf
    • http://files.lakeantoine.org/uploads/1/3/2/6/132680955/pinimidifomuteg_pivujixixafiw_tiraj_vinupu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/aruba_weather_forecasts.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/87567316493.pdf
    • https://cdn.shopify.com/s/files/1/0432/3940/7784/files/lefolivetafosixuwomut.pdf
    • https://cdn.shopify.com/s/files/1/0436/4288/0160/files/random_name_generator_java.pdf
    • https://cdn.shopify.com/s/files/1/0435/7799/9528/files/94914896942.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/minecraft_mobestiary_pdf_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4822/9271/files/50147405187.pdf
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/75974677549.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/vivojufe.pdf
    • https://cdn.shopify.com/s/files/1/0440/3593/2310/files/terry_travel_trailer_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6108/4322/files/libine.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6235/files/33951097663.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.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_off000062af.bin
109afa466cac857a8688da09263a82f0cb92d6b8e8e417c68e6c52530a8073e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AF 4876 bytes
font_01_sfnt_off00007373.bin
c511e02586ef3ac6022a6e5396248c2dc9608f46f10cf689dc990f8c86d91949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7373 10340 bytes

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