Malicious PDF — malware analysis report

Static analysis result for SHA-256 2984469e0f55a35c…

MALICIOUS

PDF

46.6 KB Created: 2020-08-30 17:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b73b5f143e07522dd13345bb1c4c0287 SHA-1: 21617e06ee3265fe013a438e9407accfc6979bed SHA-256: 2984469e0f55a35cfa9558dadc55f2d914da649690b05226e52ade7ed523c92a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.cc/wix?keyword=college+hepato+gastro+pdf'. The document body, though heavily obfuscated, also contains this URL. The presence of a link farm and the ML classifier's high confidence further support the malicious nature of this PDF, indicating it's designed to redirect users to harmful content.

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/wix?keyword=college+hepato+gastro+pdf
    • https://cdn.shopify.com/s/files/1/0432/9570/3204/files/fagufuvat.pdf
    • https://cdn.shopify.com/s/files/1/0428/6863/7862/files/3271409208.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/argumentative_essay.pdf
    • https://cdn.shopify.com/s/files/1/0429/0579/6774/files/33902208914.pdf
    • https://cdn.shopify.com/s/files/1/0429/5219/6249/files/woful.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1701/files/mixativofukasoro.pdf
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/sewuso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fedixudarat.pdf
    • https://cdn.shopify.com/s/files/1/0434/4171/7414/files/30080497661.pdf
    • https://cdn.shopify.com/s/files/1/0430/3280/5527/files/23828113245.pdf
    • https://static.usrfiles.com/ugd/cc03df_b21e7cc7b5df4d0aa83080e8d3852c35.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7b557e2baab4bf5881c387455893c6a.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/27708835853.pdf
    • https://cdn.shopify.com/s/files/1/0436/5733/0853/files/xopubaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/84118697161.pdf
    • https://cdn.shopify.com/s/files/1/0433/1808/3742/files/silipamaxubade.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/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006db5.bin
e5156c9d2c0a5a745a213b45950711aac3191829156f332cee89f2a945b10480		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB5 5208 bytes
font_01_sfnt_off00007f6c.bin
6db9cb7ffdec1a822b83bea1dccc53f6f40ef9ff192067959ed1724322159600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6C 15276 bytes

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