Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf8ca4d2ed98837…

MALICIOUS

PDF

31.9 KB Created: 2020-08-30 21:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e205cadffac081f23a226aa1c31cae4 SHA-1: 95c2a2545e11864c43df7a649c1ae3c850303580 SHA-256: 7bf8ca4d2ed98837bc2c8a33db83be3070431672438320a9cdeac8db01f8a8d1
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with one pointing to a known malicious redirector. The document body is heavily obfuscated, but the presence of the malicious URL and the PDF_SEO_LINK_FARM heuristic indicate a likely attempt to lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.club/wix?keyword=club+car+rear+differential
    • https://static.usrfiles.com/ugd/b8c837_0d7f62b6f81141dda8cfe8bf027d8c86.pdf
    • https://static.usrfiles.com/ugd/b8c837_e25b9b91e027441da1e2365086c272d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_4dcae3f53e624f2aa444ceba4c10c12f.pdf
    • https://static.usrfiles.com/ugd/bb13a2_710078fe75374b9da97f1d39f7ffbe7a.pdf
    • https://static.usrfiles.com/ugd/cf14a4_7fda78b0285c4dfbba3fd17cc492b764.pdf
    • https://static.usrfiles.com/ugd/c5d40f_3ea669b76d284cd18ee9583882f6f9b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_04eef45f742f4f87acb1d72b3f3c0026.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf703661b1b440a5b9a3181c2ce5b30c.pdf
    • https://static.usrfiles.com/ugd/daca0d_ffc1fad87d5a486288710746ff985111.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bf73c9469a149e29844297101e16ec4.pdf
    • https://static.usrfiles.com/ugd/314c35_77c33fbe5de7410ca26e74a62d87163c.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa3f79f315344e1b9542d8b04c15f966.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_off0000411b.bin
f249ab5ee2d50d1ccdd365e7a0ba5f071550748b04de7e36a31b66c19c1be904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x411B 4884 bytes
font_01_sfnt_off000051b8.bin
2347459186de92aece454c579c7f92e886ebc84d007afb1c27bb81346b71b648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51B8 9792 bytes

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