Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b001e92de4879e8…

MALICIOUS

PDF

45.3 KB Created: 2020-08-29 23:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b176bb0294c5dc6a9a5398043b1541ef SHA-1: 34b8e8f25900b20645f1461a8ad7962495e11576 SHA-256: 8b001e92de4879e8ae8c6a8797fa4b8924667c0bdddb251a7a3172202228b58d
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though partially corrupted, suggests an academic lure. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing strongly supports this attack pattern. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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.cc/wix?keyword=comment+expliquer+les+fluctuations+%2525C3%2525A9conomiques+dissertation+corrig%2525C3%2525A9
    • https://static.usrfiles.com/ugd/f1780b_fd83734115654407aee5c52c231cdfa6.pdf
    • https://static.usrfiles.com/ugd/e8506d_7fb3171f92e840f2a8cfaf748b432970.pdf
    • https://static.usrfiles.com/ugd/b8c837_daf473557cde4217b9b9c2eee6f07215.pdf
    • https://static.usrfiles.com/ugd/b8c837_60f8c5c0c5174378b206cd19527f1baf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6444/files/perutaxunivifaworopeluma.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8505/files/novafezumenolavapufijap.pdf
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/17959282947.pdf
    • https://static.usrfiles.com/ugd/9b33c5_e5959abebcb547098e698ec9c4aeac96.pdf
    • https://static.usrfiles.com/ugd/b8c837_86313ea7cb184f0ea31e33c1249df491.pdf
    • https://static.usrfiles.com/ugd/b8c837_0bcdf6cb6138444387f37b9c07b1e985.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_off00006b76.bin
42a815df208e16ec9c0ff609558402d7f2748ee27f95d5c4ddc84c392a0a5934		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B76 5716 bytes
font_01_sfnt_off00007e84.bin
61f4894d522a9e35fe0d6d970b6bd3f315a95297b10e206a0ae8823280ad34f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E84 12576 bytes

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