Malicious PDF — malware analysis report

Static analysis result for SHA-256 210df24d7d4f562d…

MALICIOUS

PDF

42.4 KB Created: 2020-08-29 22:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0509f55a532fd046b60479e8d8d76416 SHA-1: e92cbbab9d0691487d6865f29044b52e66f47b20 SHA-256: 210df24d7d4f562dc057a6a9bfba7827ac5ed6cc24e9b4e8db2a3970b0ba5dfe
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm designed to manipulate search engine results. One of these links, 'https://ttraff.ru/wix?keyword=the+art+of+neighboring+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a social engineering tactic to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=the+art+of+neighboring+pdf
    • https://static.usrfiles.com/ugd/9cfd0a_f65b2cad004d4ff599fb935d5ddecbfb.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ff7f1d9d89e4e2789087cad1ca41012.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ee74ab9be734382adc4f1d9a70bd5dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa1f4fc777774b5981621be5787aed11.pdf
    • https://static.usrfiles.com/ugd/b8c837_8038d36d41934821ac87470cbef14c3d.pdf
    • https://static.usrfiles.com/ugd/80c1db_4d70f6c4c481406e81f321a03d759852.pdf
    • https://static.usrfiles.com/ugd/b8c837_356757b73cb642b19deb0bff8ac64bd6.pdf
    • https://cdn.shopify.com/s/files/1/0432/7522/3200/files/37717436381.pdf
    • https://cdn.shopify.com/s/files/1/0454/7198/9918/files/business_law_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/7580/3038/files/mulezada.pdf
    • https://cdn.shopify.com/s/files/1/0451/2425/5898/files/cards_against_humanity_anime_expansion.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/test_angielski_czasy.pdf
    • https://cdn.shopify.com/s/files/1/0446/9764/9306/files/jeep_patriot_manual_transmission.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/64323932252.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_off00006907.bin
6bc5807668974d6401ac7636d3adf33843335bfeecbacb3ab5cb3194737f506f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6907 5184 bytes
font_01_sfnt_off00007a9f.bin
0cc64040ac1a0316a206bb7046b0475752a9bf4c46ee7662e6db397594bb6561		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9F 10120 bytes

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