Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf62d1758c893371…

MALICIOUS

PDF

46.1 KB Created: 2020-08-31 03:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a449ee1e9c87ae707f5b212af08770db SHA-1: f16b77700154276ae3e292d1bc92d37f465acd18 SHA-256: cf62d1758c8933710cf2d6ab40e8ef5361c2f3c57c7a8fd358be418fb9c8bf5e
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=decrypted+3ds+roms'. This URL is presented in the document body with a lure for 'Decrypted 3ds roms'. The file also contains a large number of external PDF links, many pointing to 'static.usrfiles.com', indicating a link farm or redirection strategy. The ML classifier 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.cc/wix?keyword=decrypted+3ds+roms
    • https://static.usrfiles.com/ugd/e5cbe5_363b8c85cb024f548be777b92a6fae65.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_a12c7bd63f5d4b7ca22123cb579b48dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_0914cf91d1d74eb097ffca1d1712fcdc.pdf
    • https://static.usrfiles.com/ugd/b8c837_8391d399524e49a5851cc79f6c8e9f19.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67cc1a50274440aa9e2f9275bacda63.pdf
    • https://static.usrfiles.com/ugd/4d400c_0ff4f14380a748aea49778cd672ac727.pdf
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/developmental_biology_gilbert_11th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/puzzles_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gikari.pdf
    • https://cdn.shopify.com/s/files/1/0439/4136/3870/files/treatment_guidelines_for_constipation_in_pediatrics.pdf
    • https://static.usrfiles.com/ugd/374ce0_4daa05ee7ef1446a940f54c516d875e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_8cfdd0b7e7d74c2eb51e171d6d389418.pdf
    • https://static.usrfiles.com/ugd/0d002d_0604218d510b4eab857a17e4e2d5c25a.pdf
    • https://static.usrfiles.com/ugd/9ec29b_5cb3c5c526bf467f88910ccc66536aa6.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/
    • https://static.usrfiles.com/ugd/374ce0_4daa05ee7ef1446a940f54c5

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066e3.bin
383f7d293ff4d3d6665c22a9636df3cd6231a52d9a74cd0d19e3196b59e3fbbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E3 5244 bytes
font_01_sfnt_off000078af.bin
2507e95842dfa87d5ed57754b2ced69bce418e11552e4adcedd64e398e74e0b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AF 15928 bytes

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