Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7840d346f36ce0c…

MALICIOUS

PDF

44.0 KB Created: 2020-08-24 18:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99729f786b60dcb5222bee2501ecd449 SHA-1: 06ac4f34552b66d69afecd64ad01f43f73349fd8 SHA-256: d7840d346f36ce0c8e73ac26b0d4564294ec0f40952de1d46960c66c267b86ab
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.com/pify?keyword=ccna+2+chapter+8+quiz+answers', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=ccna+2+chapter+8+quiz+answers
    • http://jusuvexaz.gabrielstrumpbooks.com/uploads/1/3/2/6/132681670/nitopa.pdf
    • http://files.jemskpropertyventuresinc.com/uploads/1/3/0/7/130740571/55495951a5e.pdf
    • http://files.fultonmusictherapy.org/uploads/1/3/2/7/132741136/4044597.pdf
    • https://cdn.shopify.com/s/files/1/0436/5965/7374/files/batinito.pdf
    • https://cdn.shopify.com/s/files/1/0428/6224/8095/files/ags_world_history_textbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/8434/9591/files/euclid_mathematician_information_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2054/files/gadewefuvovuga.pdf
    • https://cdn.shopify.com/s/files/1/0429/4092/4063/files/bose_wave_music_system_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3212/files/57552270351.pdf
    • https://cdn.shopify.com/s/files/1/0432/1119/4525/files/82329718209.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1175/files/jokitapidazolimolivigiren.pdf
    • https://cdn.shopify.com/s/files/1/0432/1673/2315/files/3207307306.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/31326838118.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/99795113968.pdf
    • https://cdn.shopify.com/s/files/1/0438/9984/6824/files/wurefomenodiv.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_off00006d45.bin
cab41fbc474aa269bb9bd62850a2fbef7215ba95da492a1977c5617882106112		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D45 5488 bytes
font_01_sfnt_off00007ff9.bin
f2f18ef82bd04622a9553219c42a138ad1da280cbe238555fc3b9d1a5fbaae77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF9 10408 bytes

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