Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf134829e05aea6…

MALICIOUS

PDF

34.7 KB Created: 2021-06-22 03:16:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b26811afcc0811b305adbe1cc56a5778 SHA-1: 0123ebd38af5c796edb8e0fd23c2fced0fcdc05e SHA-256: 8bf134829e05aea6504348daf94ccec6b0cf20cad11a7e5597f64350cd3ded86
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites promising free in-game currency and hacks for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm designed to attract users searching for cheats. The ML classifier also strongly flagged this PDF as malicious. The document body and embedded URLs reinforce the lure of free game items, likely serving as a pretext to redirect users to potentially malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://netcdn.co/app/431946152/como-conseguir-robux-gratis-sin-hacks-game-hack PDF link annotation
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/roblox-ninja-simulator-2-cheat-engine_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-roblox-accounts-made-in-2021_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/hack-tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/funcionando-nuevo-hack-roblox-jailbreak-phantom-forces-booga-booga_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/demon-roblox_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3216 21896 bytes
SHA-256: efb4ce8cfd961cd8c792b3ba877e35027c89afc52d0bb5629323760c97dc9066
font_01_sfnt_off00006231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 19204 bytes
SHA-256: fa668c4006ed3ca9cbed0aa4a6dd6f45ed3ff161b41f616a1100185763a81069

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