Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33d151fa63b1b85…

MALICIOUS

PDF

29.2 KB Created: 2020-10-11 19:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8203bc17943636278ad8137c3608041c SHA-1: a0c4350757027aba8ae315f30912cee1c70dbd26 SHA-256: a33d151fa63b1b8501b10cedbc1ef59b17471cee261ae1131cb4090758ddd751
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded link that redirects to a known malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the document with high confidence. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to trick the user into clicking it for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 2

  • 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.
  • 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://cctraff.ru/strik?keyword=flamenco+scales+guitar+tab In PDF document text
    • https://site-1039257.mozfiles.com/files/1039257/79146838834.pdfIn PDF document text
    • https://site-1036760.mozfiles.com/files/1036760/97931148972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1101/2770/files/25210762602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0491/3558/files/fakavabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6153/3089/files/62824121928.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6880/7586/files/tupigujuron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491c3cf0-3f5a-49cd-95cf-a326396be3ef/67908421954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4aa43e1-9c1a-43c7-8888-aaa485662f78/92147804372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d775ae-7664-43c5-befb-fbdc03843f14/27947108095.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6101 5216 bytes
SHA-256: 0fb4c55636dc10aebcbbdff7fb6b3ce9d45d7af878d48c83895cdfdb37c0fa1a

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