Malicious PDF — malware analysis report

Static analysis result for SHA-256 9558bc5d0793dd61…

MALICIOUS

PDF

41.4 KB Created: 2021-05-13 02:02:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c94224b0ab4c344c0e9e74cf43c34e3e SHA-1: 153a3bc34b5ca83aae50c1dd8d6ae04ac56818b5 SHA-256: 9558bc5d0793dd61359c89357457f01cab91cd09be40091682d3a1b81671697f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a high-severity heuristic indicating it links to a game hack redirector, specifically for 'Coin Master Free Spins'. The embedded URL, https://netcdn.xyz/app/406889139/coin-master-free-spins-whatsapp-link-game-hack, likely leads to a malicious site designed to exploit the user. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/406889139/coin-master-free-spins-whatsapp-link-game-hack PDF link annotation
    • https://www.gymun.cz/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-handbook_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/robux-miner_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/www-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-real_GM431946152.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/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/get-more-free-spins-on-coin-master_GM406889139.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/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/facebook-coin-master-free-spins_GM406889139.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_off00004755.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4755 24504 bytes
SHA-256: a631d2650ea3c02e7c9529b357e69361dbcbb510444b6d7c6959177ec5f4124f
font_01_sfnt_off00007f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F29 18420 bytes
SHA-256: bc1e597ae7b48ebdae567aa0f7d6bde22430efc02453d02bc2936cbc51cea71a

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