Malicious PDF — malware analysis report

Static analysis result for SHA-256 514cadf2a446a0ee…

MALICIOUS

PDF

39.2 KB Created: 2020-07-31 18:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae477793ea60c5864ea08790ddf7ba4b SHA-1: 6e618cd6c98dcb835efbe53ffac4282f02dc5724 SHA-256: 514cadf2a446a0eed1794dea4462dc32cc71fd7f5bfc1e666cab8b34223ab5a5
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.com/pify?keyword=self+employment+ledger+template+pdf, is presented as a 'self employment ledger template PDF' to deceive the user. The document body, though heavily obfuscated, contains this URL and other PDF links, indicating a link farm strategy to distribute 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.com/pify?keyword=self+employment+ledger+template+pdf
    • http://files.benedicthillshoa.com/uploads/1/3/0/8/130814666/dbc60c.pdf
    • http://files.writersanctuary.net/uploads/1/3/0/7/130739776/teladadapegano_xilovapikupolir_zujumima.pdf
    • http://files.myhoustonprobate.com/uploads/1/3/1/0/131069886/aa71ad.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/98599947943.pdf
    • https://cdn.shopify.com/s/files/1/0440/8341/3142/files/3998449765.pdf
    • https://cdn.shopify.com/s/files/1/0428/2092/7655/files/28450854126.pdf
    • https://cdn.shopify.com/s/files/1/0428/6588/5351/files/27582237903.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/28980936008.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/25420923627.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8916/files/25886280147.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/23671836116.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/nixuxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9709/files/64447771352.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4259/files/74584900927.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_off00005d3e.bin
753d164a600735f609a37b5cddcb0eb8f20473306726c45aeda734de932e82f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3E 5388 bytes
font_01_sfnt_off00006f87.bin
98f0bafbceaa99381c61ce0239f4ab226a2ac220682a3bb3f373f8b6a23c8c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F87 9608 bytes

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