Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c31adfec09c338…

MALICIOUS

PDF

79.0 KB Created: 2020-08-05 18:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fdcfd301ddc108d21e0ce31a03dafa0 SHA-1: 6a9a6434e784d44fc5be12c2fae0e0d39b6185b0 SHA-256: 75c31adfec09c33841167fab8da29b223e2902d1a1e1ab5402a6a96630a33fea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains the same malicious URL and appears to be generated by wkhtmltopdf, suggesting it was created programmatically to host a large number of links. The presence of numerous external PDF links, many hosted on Shopify, further supports the idea of a link farm designed for malicious redirection.

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=chain+rule+pdf
    • http://files.aprilfordart.com/uploads/1/3/0/8/130814355/7210755.pdf
    • http://files.heynoldsinc.com/uploads/1/3/0/9/130969942/fikisefu-vubixazosivavo-nomaxarinikimu-minuxixo.pdf
    • http://files.lebeerjedi.com/uploads/1/3/1/3/131398221/9575605.pdf
    • http://files.dougandjaciscreations.com/uploads/1/3/0/7/130776031/6550158.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6876/6873/files/talodafilatatamirobofuxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6635/2028/files/28591218890.pdf
    • https://cdn.shopify.com/s/files/1/0440/1650/0886/files/halloween_history_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2661/files/biwopemarif.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/jetekegememu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2160/4763/files/83065960515.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/nightcore_song_downloads.pdf
    • https://cdn.shopify.com/s/files/1/0431/2239/3244/files/runibotiwewefoxur.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/70257969997.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/tevukatunogo.pdf
    • https://cdn.shopify.com/s/files/1/0439/8628/8798/files/58495810094.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37394074323.pdf
    • https://cdn.shopify.com/s/files/1/0432/8400/5032/files/gaxukewosot.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_off0000d500.bin
ffbca76f0555306608c562b9fea7a17d13ea75320759494b2591941476b3ed25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 4856 bytes
font_01_sfnt_off0000e577.bin
bb15f4ef5c8c86d771f489346dbccd02064183ee3a58f78c9af73bafa0f4cdbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 16044 bytes
font_02_sfnt_off000118cb.bin
d420125af5e62fbac872e96b34d821323033756d7cda7fe7e25375a42b028be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 16400 bytes

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