Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80e79910004dd1e…

MALICIOUS

PDF

36.2 KB Created: 2020-08-31 03:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e9155241926553c2a9c86973f531a8b SHA-1: bd94dc97c3b904a4c42abbfa4ee7acb54a6b2ed2 SHA-256: c80e79910004dd1eec9e3139a7915db55a476281bbd3827a3674d73818a40f13
120 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The embedded URL https://ttraff.club/wix?keyword=mosby%2527s+textbook+for+nursing+assistants+9th+edition+chapter+10 is a key indicator of this redirection attempt. The document body, though heavily obfuscated, contains references to the same textbook and URLs, reinforcing the lure. The presence of numerous links to static.usrfiles.com suggests a coordinated effort to distribute this lure.

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=mosby%2527s+textbook+for+nursing+assistants+9th+edition+chapter+10
    • https://static.usrfiles.com/ugd/575363_3fc3d2033c0e4d59a9e6131b3b96c2f8.pdf
    • https://static.usrfiles.com/ugd/3e9e83_78ec4e5c7c1d4a8f857f81e4b2faeae3.pdf
    • https://static.usrfiles.com/ugd/b8c837_410ac11a24bc4a97b1c6fbf94b111d5f.pdf
    • https://static.usrfiles.com/ugd/8a419d_d94987dc31524f4c9f06d5a2f461a30a.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6568/files/duguladagigawuluduzopu.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3ead5b35a764265b45d584151b8d839.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f42116102f64ca3866508ef0553202b.pdf
    • https://static.usrfiles.com/ugd/8de238_ddfd5325aefc46c189713f369c4fcf45.pdf
    • https://static.usrfiles.com/ugd/1e32c2_99399681ee3e48aea723ade1b695e4d5.pdf
    • https://static.usrfiles.com/ugd/7f16bd_11fc6cfd49f647e6943a580f50069ec1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f97db0dcfa0e456f88456a6380c093cf.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_off00004149.bin
1ae74a8e31bace450e9f7957e03fdbdf566c69a441f7434acb99d32855c68679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4149 6032 bytes
font_01_sfnt_off000055df.bin
1f53e1e45ba5d440cde02434f0ec6f5b00571f57501e840c6a4ea7dd1a28d966		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55DF 9216 bytes
font_02_sfnt_off0000756c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756C 4324 bytes

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