Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbf41e1f07bce04…

MALICIOUS

PDF

35.0 KB Created: 2020-08-29 22:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 911b3856982a7b2171fa6f085753b973 SHA-1: 9b348352009685e3de84b3ab710c589836c6f0c4 SHA-256: bdbf41e1f07bce04436ee3cff36ea98eec52eed6528b95b1a1514cfaa0632c33
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL that appears to be part of a phishing or scam campaign, disguised as a 'test bank' for a textbook. The file also contains a large number of external PDF links, suggesting a link farm or SEO spam tactic to distribute malicious content.

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=principles+of+fraud+examination+wells+4th+edition+test+bank
    • https://static.usrfiles.com/ugd/b8c837_ed59e422ec054ee081e18de4f03e6c5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a869920c2be9433d96f3d89cfd14d061.pdf
    • https://static.usrfiles.com/ugd/b8c837_d338ef3bfea54650b258c3a3c51d4b70.pdf
    • https://cdn.shopify.com/s/files/1/0435/9317/1103/files/buffalo_ny_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/6682/6656/files/pezerob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mesibilefonupas.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/allahabad_high_court_ro_aro_question_paper.pdf
    • https://static.usrfiles.com/ugd/26481d_b4adc61b6c29412891f6345764509493.pdf
    • https://static.usrfiles.com/ugd/b4a829_0453676c5aca491ebadf63acbdb621b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_522641019a894c168b977696308f1137.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d14305228349b79a9fa88ff53bf428.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_off0000490c.bin
a1665a934ae5c57808fcfd6a0b8baefb4f0f376786fa1081f67d45351242f312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x490C 5848 bytes
font_01_sfnt_off00005cd6.bin
b879d2c4c6ac6f07aa686c53ad46f10ec5b106206cff7cbd4496eada2646bda9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD6 10028 bytes

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