Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8a894ba593f329…

MALICIOUS

PDF

43.5 KB Created: 2020-09-08 06:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ac71b57d28c7349fa9b142433445e7e SHA-1: 4ada4ee7d20ae8737e0b113688d81b7c5a8310e8 SHA-256: 7a8a894ba593f3294e4f74c9bfdc38a989311e54911812b47b1caa36da8fd703
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, including a known malicious redirector at 'https://ttraff.club/wix?keyword=black+and+white+wallpaper+for+pc'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to drive traffic to malicious infrastructure. The presence of numerous links to external PDFs, many hosted on 'usrfiles.com' and 'shopify.com', indicates a link farm strategy. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.club/wix?keyword=black+and+white+wallpaper+for+pc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b7ed05_266cfd69d33041b49fdba3c3d76ba4a7.pdf
    • https://static.usrfiles.com/ugd/c1108c_2c4660afa89648c8a17e1fceafbcbda9.pdf
    • https://static.usrfiles.com/ugd/738632_b95a73bcf42a45c59b196cf11d71e348.pdf
    • https://static.usrfiles.com/ugd/5a1791_c8a7cd2d21074cf28d0d8570e44bd891.pdf
    • https://cdn.shopify.com/s/files/1/0438/5298/8566/files/ligaxowajitabazojel.pdf
    • https://cdn.shopify.com/s/files/1/0463/5177/7954/files/livescore_soccer_app_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f066c0bc46c47048f988b9d4575c723.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_b607ff7715d94946a01d95feba4eeb69.pdf
    • https://cdn.shopify.com/s/files/1/0429/5727/5299/files/81915154500.pdf
    • https://cdn.shopify.com/s/files/1/0431/1721/5905/files/9085901808.pdf
    • https://cdn.shopify.com/s/files/1/0439/3297/5272/files/66970114720.pdf
    • https://cdn.shopify.com/s/files/1/0429/9259/9193/files/33541831657.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a3f.bin
e46b2190819afc1d3096113a51bbee821fae090017a12ca739dc52d627c2cc50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A3F 5060 bytes
font_01_sfnt_off00005b6f.bin
743fe901a92ba94ffaa283a527d6b380469b7a7633d618e652fcd2e57d86013a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6F 9988 bytes
font_02_sfnt_off00007dc0.bin
4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC0 16164 bytes
font_03_sfnt_off000092ba.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92BA 4324 bytes

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