Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df71e4d1c5ad4d9…

MALICIOUS

PDF

48.7 KB Created: 2020-07-31 14:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0335c30f70f9dcd2d68945c5433f6a12 SHA-1: e87ed293954bf91e4a070e73aba609d63e17ad70 SHA-256: 9df71e4d1c5ad4d9bb67b7d28b0e169c4b313552179e9af3e2d9a0117b234c16
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. One of these links points to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its content beyond metadata.

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=balanitis+bacteriana+tratamiento+pdf
    • http://files.prairieskycreations.ca/uploads/1/3/1/4/131406149/nekexuzobaloj_kazozijeges.pdf
    • http://files.thespae.com/uploads/1/3/0/7/130775084/1207353.pdf
    • http://files.kimikokogure.com/uploads/1/3/1/4/131483279/sesuzof.pdf
    • http://files.valleyofthedunes.com/uploads/1/3/2/7/132741556/8038013.pdf
    • http://files.valleyofthedunes.com/uploads/1/3/2/7/13
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/ronerumilagozemamar.pdf
    • https://cdn.shopify.com/s/files/1/0431/5719/2853/files/87830269813.pdf
    • https://cdn.shopify.com/s/files/1/0437/1516/6357/files/bawolekuwabu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3004/5091/files/falilakiwatulobotezizerig.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/12197651006.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/xarebi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/9050470637.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/83939140544.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0362/files/kulasubijijepekago.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_off00007ee7.bin
250830787517fbb5096582f2cb44dc2a50869c50bc6a6a267c5f6c688a4079b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE7 5280 bytes
font_01_sfnt_off000090a6.bin
f4be5e2d5b6c9b49b6c9354ec86230e27705e34f90e0e98eddc982990f82e571		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90A6 10916 bytes

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