Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3a2d33c2ccf3fa…

MALICIOUS

PDF

40.4 KB Created: 2020-08-30 07:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af05f5bd66ddce1ca8650bd26424db3c SHA-1: 68411b97e21173a3f1278b4a92d37172d334de21 SHA-256: 7b3a2d33c2ccf3fa1f629f54e409f993579796c9333b5ebbbc04193357c7d26b
150 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a resume enhancement opportunity, which redirects to a malicious URL. The PDF also contains a large number of links to external PDFs, many of which are hosted on static.usrfiles.com, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=take+advantage+of+____________+to+enhance+your+current+resume+and+skill-set
    • https://cdn.shopify.com/s/files/1/0432/6942/3257/files/32234281191.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/make_row_fixed_in_google_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/agile_development_process.pdf
    • https://cdn.shopify.com/s/files/1/0441/4255/9384/files/genitivo_sajon_en_ingles_ejercicios.pdf
    • https://static.usrfiles.com/ugd/b8c837_feeda288822742148fcb0f58dd7efac9.pdf
    • https://static.usrfiles.com/ugd/6240f8_d4c23ba352f143b09972b31c71809fb2.pdf
    • https://static.usrfiles.com/ugd/b8c837_cea1298420bc48b79c6021ddc1512889.pdf
    • https://static.usrfiles.com/ugd/76de1a_fe06ad78b974443c93dca4949529a59c.pdf
    • https://static.usrfiles.com/ugd/b8c837_814beba33fbf4176a8a69cdb8eead0bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_718fe999dfbf4161b05b24b2e5b4d640.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_d61ebf9bc615402c933ae2040a2f4640.pdf
    • https://static.usrfiles.com/ugd/4c76bf_d918e6f3e8a3438c81fd22f440d5b4a8.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_off00005e99.bin
fa1269e4d25b9fdb74b825936e6119d4ee6e932cf834b3c2f2d66754f8029f01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E99 5704 bytes
font_01_sfnt_off000071fd.bin
4cb7d272d9f3ee00bbc05cffd0f66382f3bea535a128a6833ee0759751424bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71FD 10116 bytes

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