Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69670f57f24aae1…

MALICIOUS

PDF

39.9 KB Created: 2020-09-05 14:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a819a2f5984ecd818342e6e55fc27e24 SHA-1: f6d9f530d66ae0c75dab8a46a4a30cf71ed8e9f1 SHA-256: b69670f57f24aae13edeecf4617cbc6adc11066c5cb09a3614a0694f77fc5dc1
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/pify?keyword=uses+of+chemically+formed+sedimentary+rocks'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains references to this URL, suggesting it's the primary lure. The file also exhibits characteristics of a PDF link farm, with numerous external links, further supporting a social engineering attack pattern.

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.me/pify?keyword=uses+of+chemically+formed+sedimentary+rocks
    • https://static.usrfiles.com/ugd/b148e5_af464662fed943928adc167b275e52cb.pdf
    • https://static.usrfiles.com/ugd/3fb742_ad3507a274f440f4a7712a53e984e9f6.pdf
    • https://static.usrfiles.com/ugd/f3cb45_81a29546fc2444e9ab7f874d6a84987d.pdf
    • https://static.usrfiles.com/ugd/0e2875_16cd6f584bd7468783f260e538c899ef.pdf
    • https://static.usrfiles.com/ugd/e4d7df_ff54c515ecf144f38b473135e7d63076.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7621/files/gager.pdf
    • https://cdn.shopify.com/s/files/1/0434/7537/0136/files/98912556557.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85583151980.pdf
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/puwonus.pdf
    • https://static.usrfiles.com/ugd/221f3a_8515f08153884205b28df354aca72fb2.pdf
    • https://static.usrfiles.com/ugd/9a242c_ad560f49452e43f8af317e56ba497e1f.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_off00005d98.bin
a4bad6e6c88c8463476d85b46973f94e4b711134f7964da0c04f229ac1fb0238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D98 5416 bytes
font_01_sfnt_off00006fe4.bin
0e43e719e0034940c1e47d73c21c1aa1bbc1bc0e34e080f05eb4a27aeaacb379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE4 10288 bytes

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