Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64b37bef1977000…

MALICIOUS

PDF

48.2 KB Created: 2020-08-05 20:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa58983c8afc8ce9f60599439a84a578 SHA-1: 079e4d09cf349c38f16fe02060fc243fc8328cbf SHA-256: e64b37bef1977000f4647f7409a3c0499dd32dcdef4cd2546a70751ec6a98485
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, indicating the document's primary purpose is to redirect users to harmful sites. The PDF also exhibits characteristics of a link farm, suggesting an attempt to manipulate search engine results or distribute content through numerous external links. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=net%20frog%20dissection%20worksheet%20answers
    • http://files.frecuenciarockradio.com/uploads/1/3/1/0/131070009/1133833.pdf
    • http://files.aaieonline.org/uploads/1/3/1/4/131409037/sujadulop.pdf
    • http://files.boardgameseverybodyshould.com/uploads/1/3/1/4/131437657/2190098.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5149/files/kajaxona.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/mowukeniwovulevufozovet.pdf
    • https://cdn.shopify.com/s/files/1/0439/7072/3998/files/emmener_apporter_emporter_amener_exercices.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/13720745669.pdf
    • https://cdn.shopify.com/s/files/1/0430/6147/7527/files/86185639891.pdf
    • https://cdn.shopify.com/s/files/1/0435/7505/0395/files/26381759632.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/27717427269.pdf
    • https://cdn.shopify.com/s/files/1/0430/2507/2282/files/35636486435.pdf
    • https://cdn.shopify.com/s/files/1/0437/6766/0706/files/69798062893.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/bulobajamalijik.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_off00007da9.bin
4457d0b01b34f59fbdbb34f0a18ed4a60a251aa765c583cb67601abb71bac9aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA9 5376 bytes
font_01_sfnt_off00009010.bin
10c5c4cb9a6fcd919914007b952dd1e6bf0e624ecd8a053b4f1c3cc40192d815		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9010 10588 bytes

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