Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8df0a74bd931c0f…

MALICIOUS

PDF

52.9 KB Created: 2020-09-01 16:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be4a93bb3562822bddb5fba16eb502a2 SHA-1: af594b61036d27faec85bb070ca7ae2fe80db4e9 SHA-256: a8df0a74bd931c0f77b7d6dddf0d2a96d241a7a49ecf516b537a4764799df0df
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.ru. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The embedded document body, though heavily obfuscated, contains the malicious URL and a reference to a Shopify PDF, reinforcing the redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.ru/wix?keyword=not+available+icon
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/xafiduxepejeponej.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/65195381169.pdf
    • https://cdn.shopify.com/s/files/1/0434/3028/1381/files/paladin_spells_xanathars_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8200/6171/files/symbolic_logic_copi.pdf
    • https://static.usrfiles.com/ugd/b8c837_38843d59758549e8bfa761bee76ba8a2.pdf
    • https://static.usrfiles.com/ugd/96768c_f14339b195a3492aaa1ba9d3eeb97c8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5d9d772ef3049d38fbfb0259d316877.pdf
    • https://static.usrfiles.com/ugd/b8c837_01d9be52db3f48eb85dce203f68a2ad5.pdf
    • https://static.usrfiles.com/ugd/ea78e0_348da0e8ccb34d0e80035257c2242da6.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e7c60119e7a47c4bb0677d44fedcb88.pdf
    • https://static.usrfiles.com/ugd/9757e7_88243d0b54574e2699273fc0750c258b.pdf
    • https://static.usrfiles.com/ugd/b8c837_870e0e68e57640e58ff529effbee9e36.pdf
    • https://static.usrfiles.com/ugd/469aea_28e4def0203e46f5b2e4288b43e9a59b.pdf
    • https://static.usrfiles.com/ugd/5e8de6_574a3c366025452091c1a750ef4ee5d5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084eb.bin
3d1abd1ab66465d4dd8af9186a4fcabd3aecb24e9d8fb790dfff6626100abcc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84EB 4476 bytes
font_01_sfnt_off00009438.bin
6ddefe5744c9f31a145de810fbc95c47214ddf900e8c336c9c7237af3a7fc863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9438 10652 bytes
font_02_sfnt_off0000b892.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB892 4324 bytes

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