Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb0de3aaf3855af…

MALICIOUS

PDF

41.6 KB Created: 2020-08-09 09:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad2c320b7930c6ac76470d061d7938d2 SHA-1: 1a1837a5b4dad87180a9a72f2cd4de15f72a4d1f SHA-256: dfb0de3aaf3855af2a6d51202cf84a82a08eba89163e78c9a6ceddcf0e84ad54
150 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF also functions as a link farm, pointing to numerous other PDFs, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the primary malicious action appears to be redirecting the user to a harmful site.

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.ru/pify?keyword=catabolismo+del+nitrogeno+de+los+aminoacidos+pdf
    • http://files.christinarjackson.com/uploads/1/3/1/3/131379110/jaroropo-wedabipitofivif-bonefuso.pdf
    • http://files.edityourwebs.com/uploads/1/3/2/6/132682882/suwudawene.pdf
    • http://files.uchpchicago.org/uploads/1/3/2/6/132696214/ruboxewewuruguraz.pdf
    • http://files.rijkewijnen.nl/uploads/1/3/1/4/131453146/lasinabax.pdf
    • https://cdn.shopify.com/s/files/1/0433/4862/3510/files/95899814413.pdf
    • https://cdn.shopify.com/s/files/1/0429/6084/7004/files/how_to_cancel_directv.pdf
    • https://cdn.shopify.com/s/files/1/0431/9923/4203/files/77956452892.pdf
    • https://cdn.shopify.com/s/files/1/0435/6436/8021/files/24756994750.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5902/files/lusiwuwopolul.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/cath_lab_procedures_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/7474/7545/files/abstract_art_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/19078334249.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_off000059c8.bin
b57be721bddb4328424770c1960026132e1bfff891bfe08852e4ffd2be45911c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C8 5520 bytes
font_01_sfnt_off00006c6c.bin
01f96a18a835163afe54a2261bf36c7420e1811fc3f6c2d134ed64ab579417f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6C 14916 bytes

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