Malicious PDF — malware analysis report

Static analysis result for SHA-256 12aa1ff3f24a5913…

MALICIOUS

PDF

47.6 KB Created: 2020-08-31 06:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba3a3e05e4eb2ab3edf37299bd83615f SHA-1: 8cbb439d0f50e7f129aa618598bb93c800c22e1e SHA-256: 12aa1ff3f24a59136d65b1c7bad4a3d2559cce749a990a33158033ca2b1737f8
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 'https://ttraff.ru/wix?keyword=fred+bear+compound+bow+serial+number'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external PDF links, with 'https://cdn.shopify.com/s/files/1/0430/2258/1923/files/tewexudubebuzakevane.pdf' being the first identified. 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/wix?keyword=fred+bear+compound+bow+serial+number
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2258/1923/files/tewexudubebuzakevane.pdf
    • https://cdn.shopify.com/s/files/1/0432/7345/3724/files/best_books_on_big_data_analytics.pdf
    • https://cdn.shopify.com/s/files/1/0436/2695/4905/files/adams_tax_form_helper_online.pdf
    • https://cdn.shopify.com/s/files/1/0459/7006/3520/files/foribuluke.pdf
    • https://cdn.shopify.com/s/files/1/0437/3990/6197/files/understanding_viruses_teri_shors.pdf
    • https://static.usrfiles.com/ugd/26938b_34fc5ae6eb514a3096e130841a572a12.pdf
    • https://static.usrfiles.com/ugd/b85eb0_e6f5915cfe7a42c8801743fb0e92a333.pdf
    • https://static.usrfiles.com/ugd/b7ab08_dc4d099ac685480d93d2adf3b5c4f6d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_04eb9e0fcc4344748837390be136e3eb.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9506/files/gaxetab.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/sairat_ing_app.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/90804501936.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_off0000612c.bin
a66af8afcfc932f026e11af93e546de407fa4b4f29fc079aeca8e60677936e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612C 5408 bytes
font_01_sfnt_off0000737e.bin
3f61201dbc50c77e18aec0e707a9bdfd72bfe77ca87a58dd083d527970b6a295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737E 10120 bytes
font_02_sfnt_off00009649.bin
8d44ea7027c694d37513832a9865fb840ec0d483a5677c247b1fb60fe3c11543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9649 17732 bytes

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