Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b42395fc04617f9…

MALICIOUS

PDF

40.3 KB Created: 2020-08-30 11:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9fdb299de3fb231f563feced0ea5358 SHA-1: 6a696641beae9638695589c2e4e3a300ba0d64cf SHA-256: 4b42395fc04617f9678abc80c7bb875c26ab85eae9261497d66769e365b271d3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains a significant number of embedded links, many of which point to external PDF files. One of the primary links, 'https://ttraff.ru/wix?keyword=calligraphy+exercises+for+beginners', is identified as a known malicious redirector. The document body appears to be corrupted or heavily obfuscated, but the presence of numerous links suggests a tactic to distribute malicious content or manipulate search engine rankings.

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=calligraphy+exercises+for+beginners
    • https://static.usrfiles.com/ugd/b8c837_6e43aeba9e79492dbf2cae5d68a824a9.pdf
    • https://static.usrfiles.com/ugd/1f2646_3d57c3f9c7374eb6b443107b171b7467.pdf
    • https://static.usrfiles.com/ugd/b8c837_e779b13cfdce488bb4cb7acf164f97d5.pdf
    • https://static.usrfiles.com/ugd/c20ea7_2052a55b839b4265a3160ef88e50ca90.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9434/files/bleacher_report_summerslam_predictions.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/vonepufavututabenaf.pdf
    • https://cdn.shopify.com/s/files/1/0447/7324/5077/files/all_ps2_games_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/pazita.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/changeling_the_dreaming_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/kizumodugokexalafufi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/desanavabiki.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/37949270495.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_off00005efb.bin
999c464552501742bc34b19b42c6e3f7e4f0a641006e2b5c9aab6a8054de4b8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFB 5492 bytes
font_01_sfnt_off000071b0.bin
7eb04606e91f67ab966373284ca934f64038f02dd74a351772f4884af0bbd475		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B0 10316 bytes

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