Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cdc9b9d4af2734…

MALICIOUS

PDF

46.7 KB Created: 2020-07-30 04:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3fbe44db8f24241df459538934fa7c2 SHA-1: 9cf6ce21e1e53a07d84d5aa4b3f1a1f0a2d4abec SHA-256: 54cdc9b9d4af2734289d314f71cb539cd719b54a9a63067facc701f528dd2ab8
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=clase+cestoda+pdf, which is likely used to redirect users to further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated.

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=clase+cestoda+pdf
    • http://files.michellemcdanielportfolio.com/uploads/1/3/1/4/131407901/ea8788279f.pdf
    • http://files.poppyavenueboutique.com/uploads/1/3/1/0/131070178/wuwapimej_garajabiwinizot_xafenefejir_gozubumaliraf.pdf
    • http://files.antonellascafe.com/uploads/1/3/2/8/132816066/gijebe.pdf
    • http://files.livefreeandfarm.com/uploads/1/3/1/1/131163969/d1cc00d.pdf
    • http://files.ubcathens.com/uploads/1/3/0/7/130739043/mavufazevidozuxuvifu.pdf
    • http://files.poppyavenueboutique.com/uploads/1/
    • https://cdn.shopify.com/s/files/1/0431/5486/6333/files/88728675716.pdf
    • https://cdn.shopify.com/s/files/1/0440/5005/5318/files/natunukufa.pdf
    • https://cdn.shopify.com/s/files/1/0437/5760/0920/files/8111438896.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/memunikuveb.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/30815544364.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/34104615835.pdf
    • https://cdn.shopify.com/s/files/1/0429/6641/7571/files/53890392224.pdf
    • https://cdn.shopify.com/s/files/1/0435/4595/2408/files/96958373825.pdf
    • https://cdn.shopify.com/s/files/1/0432/3177/2835/files/10595690801.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/satisaderisatekizotelun.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/sefikavizedinipirugerifag.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_off00007c43.bin
6e07888af155a48e12ce3448e25738932eaaab4eab44c2b0b248a055e8c0855d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C43 4708 bytes
font_01_sfnt_off00008c54.bin
76e73fa3797fb5846dc11d9da782ce77130d6c76125669a31739ef6a7a952557		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C54 9816 bytes

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