Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d51baec892fea27…

MALICIOUS

PDF

44.2 KB Created: 2020-08-31 18:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96fc9ce49f76001982f777391a8e1e4f SHA-1: 1702c6dd0c6c90893e31dbcc638271d41438fd9c SHA-256: 1d51baec892fea272b697f8a0b2a67a6e5a2e9e17fbc78b4f6d28fd1cf957e3a
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=adobe+audition+2017+kuyhaa'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify and static.usrfiles.com, further supports a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier also 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.cc/pify?keyword=adobe+audition+2017+kuyhaa
    • https://cdn.shopify.com/s/files/1/0430/7828/7513/files/rotejanejuba.pdf
    • https://cdn.shopify.com/s/files/1/0433/7637/8014/files/22345159359.pdf
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/kegakowovobasopetaxuju.pdf
    • https://cdn.shopify.com/s/files/1/0438/9899/4856/files/46664292758.pdf
    • https://cdn.shopify.com/s/files/1/0432/5815/1070/files/53533450791.pdf
    • https://static.usrfiles.com/ugd/b8c837_1858676660804e6b885624829c01250d.pdf
    • https://static.usrfiles.com/ugd/05900a_af6da79b612942f7b531b8e07985d262.pdf
    • https://static.usrfiles.com/ugd/b8c837_63d74fb18a554f81931d84a70dbeb211.pdf
    • https://static.usrfiles.com/ugd/eb4c03_868939375ed64bd6a9003e8e10d0b9e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d43b6ec7328043178df670c7166d41a8.pdf
    • https://static.usrfiles.com/ugd/15cd4d_1104b22120fc481c860243463ac26a57.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f0ef534d9c14e938ebf0f527d2bec38.pdf
    • https://static.usrfiles.com/ugd/fe83c3_795e76a503164f5595123107473c0d68.pdf
    • https://static.usrfiles.com/ugd/b0b521_aabcb996a56d489b8324e1543299ec05.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_off00006af4.bin
8795047221022b9e1c532067c3c848ca571c1270e3a9871c378d3c818322c44a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF4 5308 bytes
font_01_sfnt_off00007d19.bin
4fdc62fcf1692c0815f92818076910c628af240f8384c41f50db552b5f194bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D19 12020 bytes

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