Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be9248f960a6a53…

MALICIOUS

PDF

42.5 KB Created: 2020-08-30 07:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af035ab7b9423e56a55a6e262f9dd0c3 SHA-1: 769808865a7de7bcd9c27b3c0521d652d7bbc4d0 SHA-256: 1be9248f960a6a531288dd537c94b6cc175ec3194cb537a39e64744b15883597
150 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=reading+comprehension+for+grade+10+students', is flagged as a malicious redirector. The document also exhibits characteristics of a PDF link farm, with numerous links pointing to external PDFs, likely for SEO manipulation or to obscure malicious intent. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector suggests an attempt to lead 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/wix?keyword=reading+comprehension+for+grade+10+students
    • https://cdn.shopify.com/s/files/1/0438/9208/0792/files/billet_chapelle_sixtine_sans_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/52637902101.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/75715298037.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/robin_cook_acceptable_risk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/3987216397.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9597/files/vofibe.pdf
    • https://cdn.shopify.com/s/files/1/0435/0273/1430/files/61214966950.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7094/files/1978778491.pdf
    • https://cdn.shopify.com/s/files/1/0438/2208/8354/files/arduino_mega_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/fokelisubatudasogorafi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5509/4677/files/susenokidom.pdf
    • https://cdn.shopify.com/s/files/1/0434/8706/8322/files/parupozumog.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_off00006627.bin
b5f8627e2953c48658db03ca6a0474ed6b75edb7d46d14f4446cf1d4f6ea22be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6627 5740 bytes
font_01_sfnt_off00007981.bin
5c572b36d147fa44455309e65243f9f49f53c63b3cc634be82d7bbb0d9919a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7981 10368 bytes

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