Malicious PDF — malware analysis report

Static analysis result for SHA-256 595fc3232d69af92…

MALICIOUS

PDF

38.8 KB Created: 2020-08-29 04:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 016b0ef7e6a732db2fa81ae355fcd0b9 SHA-1: 67ec776aca32a067f23da9b72d8dfe0e9c8ec88d SHA-256: 595fc3232d69af926fe9ae42bd415e79ee5248ec5576b299c64cc233a02e2a22
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains keywords related to educational worksheets, suggesting a lure. The presence of a PDF link farm heuristic further indicates malicious intent to drive traffic to external sites. The ML classifier strongly supports the malicious verdict.

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=math+worksheets+double+digit+addition+and+subtraction
    • https://static.usrfiles.com/ugd/b8c837_c600590d24314c688e96f21fb110b748.pdf
    • https://static.usrfiles.com/ugd/b8c837_9acd4a48cc8e4e84a570bd63d510f73d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a6048dbb0ca424ebf1ff9e8cf645d5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_855ab5dddd4c4d17b602813653cd5d8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_15d987383e264efbaaf12855d5cf5ee2.pdf
    • https://static.usrfiles.com/ugd/b8c837_669cf7f73d7d47788a173a295d4e4d50.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/6997/files/fixiwezabemarixorut.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/62247276136.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/38721070210.pdf
    • https://cdn.shopify.com/s/files/1/0463/5315/4214/files/rogues_george_rr_martin_epub_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/ablebits_for_excel_2010.pdf
    • https://cdn.shopify.com/s/files/1/0439/5171/8558/files/31144403126.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/gojojo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/90092083900.pdf
    • https://cdn.shopify.com/s/files/1/0435/8979/5998/files/pdf_converter_to_word_free_download_for_windows_7.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_off00005a71.bin
c740ce3a3fe804ffea839331b505fc85f8611a465902e8a339ce656e36c10ff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A71 5500 bytes
font_01_sfnt_off00006d35.bin
a343a1bef74470032b876244037673cdb1a87d6264af1467a600b2f288d4e297		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D35 9628 bytes

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