Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ccd5c5972a2f63…

MALICIOUS

PDF

46.9 KB Created: 2020-09-06 20:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 061623e0ac5e2aebf9c30eb7dffc4ccf SHA-1: bfae71b55ef9edf9b49f05f3f34421018a15007c SHA-256: 76ccd5c5972a2f6380b3bccb575ece321ed0a981ad45f6c9928d9984e63f0c11
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which points to a URL designed to lure users with a search-engine-optimized topic. The document body, though heavily obfuscated, also contains this URL and numerous other links to external PDFs, suggesting a link farm or redirection strategy. The ML classifier strongly supports the malicious nature of this PDF.

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.link/wix?keyword=southern+ontario+duck+hunting+guides
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/palufozenidewuwanimi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/managerial_accounting_journal.pdf
    • https://cdn.shopify.com/s/files/1/0438/2362/8450/files/6599464954.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b2974345fa840c3ac7713ef66b71387.pdf
    • https://static.usrfiles.com/ugd/b8c837_0422b0f38d414c03b841382b0711e9bc.pdf
    • https://static.usrfiles.com/ugd/fdd6c2_4f39274081da4b12b6e18edfe1f7fff3.pdf
    • https://static.usrfiles.com/ugd/25c42e_fed32016f2b2462aad442a8437488518.pdf
    • https://static.usrfiles.com/ugd/b8c837_40c5fd9c944a481ea9dd43ed29ba0cb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_50302e195d97412e80bf43dd01a2dd3b.pdf
    • https://static.usrfiles.com/ugd/ff2e72_fe34dfb6b8d144a184c8a29e6f2ff7a0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006807.bin
a350a47f179f8b55d05e4135a38260e22ca56bc5a12f32926a3ee6484abeaa94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6807 5216 bytes
font_01_sfnt_off000079b5.bin
07aeaceadbdb0b47d77847cae86c1f7aa2c58d0a37ad2b83dd584eec29b06609		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B5 12104 bytes
font_02_sfnt_off0000a130.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA130 4324 bytes

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