Malicious PDF — malware analysis report

Static analysis result for SHA-256 b572b064d000b8a4…

MALICIOUS

PDF

38.7 KB Created: 2020-08-29 21:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b088e4c0661659c59e882e62f1bd63f SHA-1: 03720fd106c1a23f9d679f1325e1cc6b2e4705f4 SHA-256: b572b064d000b8a430ea588b0be3a5cf1c6bede3129a546626fa704db1d8af59
120 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, specifically pointing to 'https://ttraff.ru/wix?keyword=handwriting+sheets+pdf'. This URL is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, also contains this URL and numerous other PDF links, suggesting a link farm or redirection tactic. The presence of multiple PDF links, many pointing to static.usrfiles.com, indicates a potential attempt to obscure the final malicious destination.

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=handwriting+sheets+pdf
    • https://static.usrfiles.com/ugd/ce14f3_029c7009721b4835b2729e908df72737.pdf
    • https://static.usrfiles.com/ugd/4dd980_6d0815bebb404c16a6bda0873781afdb.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6ed77a08ea746e39774dbfc7ea47fd7.pdf
    • https://cdn.shopify.com/s/files/1/0430/4394/6649/files/kobitar_boi_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_44c12939e27449dca1e76783b80fd58e.pdf
    • https://static.usrfiles.com/ugd/b8c837_04df39916c0448b7893174574e4d757d.pdf
    • https://static.usrfiles.com/ugd/3f80ec_2bf46b7c466a41189aaf5fabe62f7799.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf703661b1b440a5b9a3181c2ce5b30c.pdf
    • https://cdn.shopify.com/s/files/1/0447/2075/0745/files/55629186533.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3073/files/30282857092.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b33.bin
1d6f56d4a039428d4c83f8c2377a907de8ea05229f08e0864e6020bc9fc2fbf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B33 5004 bytes
font_01_sfnt_off00005c32.bin
bfc3295598b4831236097bf9efe69f1cc92e31e4eb726558776ac402a7f5fbb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C32 10744 bytes
font_02_sfnt_off00008049.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8049 4324 bytes

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