Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcf0afd099c54a4…

MALICIOUS

PDF

45.0 KB Created: 2020-08-29 11:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e0fa8e7e17436e310e1a4f1a616e16c SHA-1: 3f79ea7cfc303cbc17e437b3804ec47988b20d30 SHA-256: 6bcf0afd099c54a4abcb46792a57466da0cdec2af6ce41b3fc69c718c7dec64f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.ru/wix?keyword=music+flash+cards'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to benign Shopify domains but are likely used to obscure the malicious intent. The document body, though heavily obfuscated, contains the malicious URL and several benign URLs, suggesting a lure to a malicious site.

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/wix?keyword=music+flash+cards
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5730/7039/files/sebekusizoba.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6488/files/enlaces_quimicos_ionicos_y_covalentes.pdf
    • https://cdn.shopify.com/s/files/1/0428/8167/9523/files/90461419992.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/97355456788.pdf
    • https://cdn.shopify.com/s/files/1/0435/4038/1855/files/76258935674.pdf
    • https://cdn.shopify.com/s/files/1/0440/1594/3845/files/70762422307.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.pdf
    • https://cdn.shopify.com/s/files/1/0438/7835/1003/files/outlook_express_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_d589261015ba4db2bf5b595147f10a59.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6c821a334da487bb98c5a7757e9deb7.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab4b9dd1f4d2481b88e569ff2cff4b1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b1b6fdcb2ee450ab16f69ee811afecf.pdf
    • https://static.usrfiles.com/ugd/b8c837_1779f72805b5484d8595fa4a2d796370.pdf
    • https://static.usrfiles.com/ugd/b8c837_29cc4f099a0f4d629efbc9cdbdbc87e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8dff59e5c2c43229374fb4de79b666b.pdf
    • https://static.usrfiles.com/ugd/b8c837_835c1276d6614d6c9616b40e197738c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e55e4022a0413fa662276bc3f6391d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006602.bin
9fa9b089f73822e67b9847b333ba909b719c895394425ac8b2d5a2594ec037fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6602 4580 bytes
font_01_sfnt_off00007593.bin
71923fc26185c8e5ee4aaa6ac5f87900d1379bdb9e606a9f615bd71d4df96382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7593 10420 bytes
font_02_sfnt_off0000994b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x994B 4324 bytes

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