Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df5160301936cc3…

MALICIOUS

PDF

41.7 KB Created: 2020-08-20 19:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a320ec1ec23b5c02fef53fa346b97dec SHA-1: bd4347244d6146cb9ee22bc45326f033338570fb SHA-256: 9df5160301936cc3619517970e05d43876b01fa5c8372f34f5494e4e6f77ffb3
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL, 'https://ttraff.cc/pify?keyword=exponent+rules+worksheet+algebra+2', is designed to lure users by appearing to offer educational content. The ML classifier strongly indicates maliciousness, and the PDF structure suggests a link farm designed for SEO manipulation to distribute malicious 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/pify?keyword=exponent+rules+worksheet+algebra+2
    • http://files.gabrielledeveaux.com/uploads/1/3/2/7/132740399/dasegewerugebi.pdf
    • http://files.caffelina.com/uploads/1/3/0/8/130874676/8565648.pdf
    • http://files.maryjomann.com/uploads/1/3/1/4/131438274/8938062.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/3034102117.pdf
    • https://cdn.shopify.com/s/files/1/0430/7392/9377/files/5401686069.pdf
    • https://cdn.shopify.com/s/files/1/0450/8496/7077/files/25608213121.pdf
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/joxufo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9717/0847/files/wevafogin.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/fluticasone_salmeterol_davis.pdf
    • https://cdn.shopify.com/s/files/1/0462/7680/4768/files/tigixez.pdf
    • https://cdn.shopify.com/s/files/1/0448/4576/0669/files/mainsheet_blocks_lewmar.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/82016781593.pdf
    • https://cdn.shopify.com/s/files/1/0429/5570/2425/files/86343379528.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_off000063bb.bin
d5a33abe715d8f38e70378574760e8bf5020bf4698c793ea05587c351241e9c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BB 5536 bytes
font_01_sfnt_off0000769c.bin
35ee75fe4b7bb96ccc44d30477305369b6fccccda4956a801e6706761bf99c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769C 10496 bytes

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