Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd8961fc4438f3d…

MALICIOUS

PDF

41.6 KB Created: 2020-09-16 19:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02516977577754cab6d9fd5d1d3133b2 SHA-1: b62862a27bc7fa41c67a114b810487109615b90e SHA-256: 1cd8961fc4438f3dceb1e488c78cabbe4ba5c505fb0836631f63eb758ddae105
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, specifically pointing to 'https://ttraff.ru/wix?keyword=atomic+size+chart+ski'. Additionally, the file exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same redirector URL and a benign-looking title, suggesting a lure.

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.ru/wix?keyword=atomic+size+chart+ski
    • https://f43cb5c9-e0bc-4102-a3ee-9dab2e595782.filesusr.com/ugd/e2b09b_e6875234384b420daf3453445320187b.pdf?index=true
    • https://65de848e-d464-464c-be7d-7e63fa8691b1.filesusr.com/ugd/3ed902_bdbc49b3518d4198b2756a66f103adb2.pdf?index=true
    • https://066bd54f-d96a-4d44-8956-35f466939e53.filesusr.com/ugd/9d869b_fc74d2eedbf049f5b386ca3f5683bde8.pdf?index=true
    • https://03797c2e-fd19-4632-a03b-39d9161a39e4.filesusr.com/ugd/594ae5_5840e64fae834d528c027f7a66ad0123.pdf?index=true
    • https://9d7c6ec5-f462-483b-b493-05c8e4fa393d.filesusr.com/ugd/31593d_52b8885f55614f2d824d0a08a3e07b25.pdf?index=true
    • https://b80ec8bf-e3f3-4fbd-8901-88587481a279.filesusr.com/ugd/73c254_28981a5e0678422ca52e7103dd23ea2c.pdf?index=true
    • https://bf1b1a07-7471-4358-861e-fa8ab0472ac5.filesusr.com/ugd/c83fdb_5ad80b60f6dc474186238c3ceec45edb.pdf?index=true
    • https://5f3bc832-6483-482e-9e4e-c7d8e403d35b.filesusr.com/ugd/9e41f0_88b72f7f81be43e09ded8eb9b5660436.pdf?index=true
    • https://015d7991-b3ae-4e29-8c76-58c358caba0d.filesusr.com/ugd/f1780b_d86b4ca912f249708489cba8de60354e.pdf?index=true
    • https://a6eccd73-62b8-4506-80cf-3ef0afc17231.filesusr.com/ugd/dc8a8e_600b4068857f46ffaeb630394c5d6ff8.pdf?index=true
    • https://ea5d09d0-9a21-4858-9cbf-78b29c8eaa9b.filesusr.com/ugd/3e7897_1732770bf0594edcb26ade0ead37cd3b.pdf?index=true
    • 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_off00006158.bin
5058369774697c7da2f6d37bd737aaad018841685a5685d1bf5ffdeff789cafa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6158 5112 bytes
font_01_sfnt_off00007292.bin
9e1ccceab27e046b4d50ddd5697ab24a218ab398508331567954f4f808dabd7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7292 12428 bytes

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