Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b61db6de5f7283…

MALICIOUS

PDF

40.7 KB Created: 2020-08-30 09:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b25d161d972d1d70da63a8ec9c7b9204 SHA-1: 2a3ecec9c1f250d141fac215695b0de16b2cf258 SHA-256: 91b61db6de5f7283b5e6cf212dc0d51665b3cf327b25ffd4ad788f4730859313
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL designed to trick users into downloading drivers. The document body, though heavily obfuscated, contains text related to 'Bluetooth peripheral device driver downloads' and the malicious URL itself. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a lure for malicious downloads.

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.link/wix?keyword=bluetooth+peripheral+device+driver+downloads
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/arsene_lupin_sherlock_holmes.pdf
    • https://cdn.shopify.com/s/files/1/0432/1493/0084/files/canoscan_lide_210.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/79697536156.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0815/files/90560046029.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/fuxenezogeremutimenamus.pdf
    • https://cdn.shopify.com/s/files/1/0435/0479/5800/files/86491723477.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ff26027bea34790ad2ae5feb0bfd212.pdf
    • https://static.usrfiles.com/ugd/e4ff69_bff6d57a58524898b204acf6c57de4c0.pdf
    • https://static.usrfiles.com/ugd/71fd01_c7e0c0969a2c437e9852390ba2720276.pdf
    • https://static.usrfiles.com/ugd/b8c837_58c7b4841bae4ed893488f877f87e318.pdf
    • https://static.usrfiles.com/ugd/5438e3_366c60a043464021b0768f02391f3675.pdf
    • https://static.usrfiles.com/ugd/15ebe2_e3223865ebba4ab99807269cc35d02d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_f146a7b574214dc48fe5ebdc21903352.pdf
    • https://static.usrfiles.com/ugd/b8c837_d78f471f79da4167b0a7e9953e87252a.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_off00006161.bin
8f9b585f68776623b3bdf7ee2feda38304f6f0553b2e6557f9410eb39e2da4e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6161 5364 bytes
font_01_sfnt_off000073ac.bin
90f059305e12b0b43848cfa14b43e6ff668c20cb1ea94812a7888a19ebfdb779		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AC 9788 bytes

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