Malicious PDF — malware analysis report

Static analysis result for SHA-256 e623267dd3749000…

MALICIOUS

PDF

42.4 KB Created: 2020-08-09 21:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a595508c2d03f95a817c107e9bba1ea SHA-1: 905ecce338b923c754e200d6cd0220628d07639b SHA-256: e623267dd3749000c6b4e7d6cd22c5d7b577f37917c03e2d7f7495003875bdb9
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for a book. This indicates a social engineering attempt to trick the user into clicking the link. The document also exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, likely for SEO manipulation or to obscure the malicious redirector.

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=descargar+libro+de+estadistica+descriptiva+pdf
    • http://files.nbpsrc.ca/uploads/1/3/0/7/130740127/kukotu.pdf
    • http://jutis.martineauelectric.com/uploads/1/3/2/7/132712358/katokod_mexovanu.pdf
    • http://files.kimklassybling.com/uploads/1/3/1/6/131606901/7323609.pdf
    • http://files.ecc-wgpc.org/uploads/1/3/1/8/131857544/xozovasakovifi_nobexiwamimipe_kitukow.pdf
    • https://cdn.shopify.com/s/files/1/0437/8234/0770/files/22103835623.pdf
    • https://cdn.shopify.com/s/files/1/0439/9307/1774/files/78596689790.pdf
    • https://cdn.shopify.com/s/files/1/0431/7370/7925/files/caesalpinia_coriaria.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/48320573104.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/fnaf_universe_mod_1._7._10.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/richard_feynman_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/69785403097.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/concepto_de_analisis_financiero.pdf
    • https://cdn.shopify.com/s/files/1/0434/8080/9625/files/chakras_in_human_body_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/dejugifanunimawediw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/mazetokosuvedetubixexe.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/litafejovukafevinajekow.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_off000063b4.bin
5fe8a6659e9b43e5c4b31056730e16aec993f4971882a4ff134101ef24a08a63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B4 5520 bytes
font_01_sfnt_off0000768e.bin
b1ce1ab7626ffd68f28c58781e5b45b78a2a5899aeaca927297c11f7dc648830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768E 11116 bytes

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