Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2412bbcc2963a36…

MALICIOUS

PDF

40.4 KB Created: 2020-08-08 09:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5696b90c9c8e65764f445838ff49d0d9 SHA-1: 6b80bc9294e0688ebb60dad2cf33d6af99d89b68 SHA-256: c2412bbcc2963a360892c37ebdbe55df0d984dd0e4414737be8f845fb0f4b669
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.cc/pify?keyword=connected+mathematics+grade+7+pdf', which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted PDF links, suggesting a link farm or SEO poisoning tactic to lure users to malicious content.

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=connected+mathematics+grade+7+pdf
    • http://tuxuwut.gallery-ww.com/uploads/1/3/2/6/132682883/279364.pdf
    • http://funafum.the-authorscorner.net/uploads/1/3/0/7/130776433/8817193.pdf
    • http://files.priestlysalvage.ca/uploads/1/3/0/7/130775220/c7ac1ad82c.pdf
    • http://files.riveroflifergv.org/uploads/1/3/1/8/131856108/7956406.pdf
    • http://files.cfnaturalhealth.com/uploads/1/3/1/1/131163643/2829028.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/812087529.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/kotor_2_personal_crystal.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/99291065898.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/14049041434.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/www_hp_com_support_colorljmfpm277.pdf
    • https://cdn.shopify.com/s/files/1/0434/0098/6787/files/haynes_holley_carburetor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17524121831.pdf
    • https://cdn.shopify.com/s/files/1/0433/8244/0103/files/92174834737.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/79053343061.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/mathematical_formulas_in_excel.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_off00006160.bin
40e8b59f3275618a461c531211e4943b7a9099ebbf2c3c084512453caee3577f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6160 5524 bytes
font_01_sfnt_off000073ff.bin
0b20021e28c0c85094d97a6efe7f3934665e3a79cfd89d4f81c947f64e085162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FF 9624 bytes

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