Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f81e28280e8dbc…

MALICIOUS

PDF

38.9 KB Created: 2020-08-29 23:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebe6e7bfdc877c0a20419d5dc3e1c88f SHA-1: 0def64ddfc676a6602d1519b90a97ac8a70125c7 SHA-256: d3f81e28280e8dbc02a80735b7cea7d5686d1358f8191b97c08f7d0d9bbe3e4f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=leather+patterns+templates'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to static.usrfiles.com. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and references to 'leather patterns templates', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=leather+patterns+templates
    • https://static.usrfiles.com/ugd/b8c837_7e1b23471f6f4d3e8f2d2802ff2bfa3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b41ed9564edc49e481e31d1d9dac9b30.pdf
    • https://static.usrfiles.com/ugd/b8c837_b888492a9d5241b69919aff05329a733.pdf
    • https://static.usrfiles.com/ugd/cf14a4_383c58cb962345c39c7aa9223b5f000a.pdf
    • https://static.usrfiles.com/ugd/b8c837_32307e46f22b4d13a12dade640d34f83.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2727/files/bubarutafajodalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/96071094282.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/8182266310.pdf
    • https://cdn.shopify.com/s/files/1/0428/8472/6943/files/24635214940.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27622062760.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_off00005c49.bin
77f7766ddcf13c8adb928666cc9ae3b872021a12941ad9864c74d7c4c808521b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C49 5000 bytes
font_01_sfnt_off00006d17.bin
ad0950b79e3e652825a2947a59bf20bde18fc8a12cf619d89eaf7453c52f1dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D17 9968 bytes

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