Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21b811fa9b14e17…

MALICIOUS

PDF

41.3 KB Created: 2021-05-18 03:39:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 616dd9ad2d1ba81dcdd33915250823fc SHA-1: e060e0231de1145afeb7f2e1ae6d476d82557ed4 SHA-256: d21b811fa9b14e179e73874e6f2bffc2fe7e1d06b461b3df12f2f3bfafc6a96b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-confidence heuristic indicating it links to a 'game hack' redirector, specifically pointing to the URL https://netcdn.xyz/app/431946152/rbx-earn-game-hack. This URL is likely used to deliver a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, contains references to this URL and appears to be generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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 https://netcdn.xyz/app/431946152/rbx-earn-game-hack PDF link annotation
    • https://www.gymun.cz/images/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/robux-miner_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-handbook_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000487a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x487A 24488 bytes
SHA-256: 4c8e0effa446b6c762075e350f17882e1a34fe15fadf7595bbe79743152666a8
font_01_sfnt_off0000805d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805D 17796 bytes
SHA-256: 5d96850db391640a789f6b9575203aa6a74b29f0cc3cc6ce507ef88e04be182a

Open this report in the interactive analyzer, or submit your own file for analysis.