Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01d77532a1baf1a…

MALICIOUS

PDF

35.0 KB Created: 2020-08-31 03:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ba013fda80eb86a97c2e1f151776412 SHA-1: 39b22e615cb7ee096ea3f186ddd47c2136691bf4 SHA-256: d01d77532a1baf1af397cd33a6d59ac798bb59eab68f22bbebf780caf49defc2
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of external links, many pointing to a redirector. The primary malicious URL identified is https://ttraff.ru/wix?keyword=my+rotten+redheaded+older+brother+worksheets, which is associated with known malicious redirector infrastructure. The document also exhibits characteristics of a PDF link farm, with numerous links to static.usrfiles.com, suggesting a potential SEO manipulation or content distribution scheme.

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.ru/wix?keyword=my+rotten+redheaded+older+brother+worksheets
    • https://static.usrfiles.com/ugd/6da380_4c84ef1359f0425ab995d9f1120cc2fe.pdf
    • https://static.usrfiles.com/ugd/a1fb72_562a029f276847168f991aa21356f447.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7493162631d4435b092bae9165f26ed.pdf
    • https://static.usrfiles.com/ugd/d4da64_d3375e3a41504cc099b47760375c45ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_65a89d287a984481afab65a9a83a6242.pdf
    • https://cdn.shopify.com/s/files/1/0431/7406/8390/files/vizefigevodir.pdf
    • https://cdn.shopify.com/s/files/1/0463/2615/3371/files/gulenemufedijutojaz.pdf
    • https://static.usrfiles.com/ugd/105a8c_3a70a815ae8d4b398d0b79bdbd3284fc.pdf
    • https://static.usrfiles.com/ugd/7e6083_7f900a54b131435c98aa16dd8b0f79f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_a351a8f848b64f968329e47f005afefe.pdf
    • https://static.usrfiles.com/ugd/e42ee3_11e984c5333542aaa9280e5e2c187143.pdf
    • https://static.usrfiles.com/ugd/1d64af_4c2d1a3ee79e4d76be857f71b5e38328.pdf
    • https://static.usrfiles.com/ugd/b8c837_421e14b7ca234560853dc5bebd232cee.pdf
    • https://static.usrfiles.com/ugd/3be3a7_80d21263bd124243a6bde6ddfa26c30e.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_off00004b97.bin
261748de6f314c4edcda688949d2234b53e6dfd21a7d2a53c796f30c9304ac60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B97 5316 bytes
font_01_sfnt_off00005db9.bin
ec0d5b9676aae965e547ff6a3afc1d2c6aff63cf27562fce7923f8d3c38a9a59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB9 9724 bytes

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