Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adc5f3e820c426f…

MALICIOUS

PDF

42.6 KB Created: 2021-05-12 21:05:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 578c0530916157118a7deaf452dac958 SHA-1: a1b3407031ccd37ff3388fbe3d190bca2349baca SHA-256: 4adc5f3e820c426f16dd24ab0e5b5eec295e1ef6975d78e8a0520f82b3a32c43
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic indicating it links to a game hack lure, specifically pointing to a URL that promises 'descargar hack coin master'. This suggests the document's primary purpose is to trick users into visiting malicious sites, likely for malware distribution or phishing. The embedded URLs and the ML classifier strongly support a malicious classification.

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/406889139/descargar-hack-coin-master-game-hack PDF link annotation
    • http://bemviverclin.com.br/images/coin-master-game-hacking_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-free-coins-and-spins-today_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_off000047d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47D4 24900 bytes
SHA-256: 5880fa52a2f4bad194bada9a000785e259ae08aee48d441c4c0ccd0afdc72cd4
font_01_sfnt_off00008132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8132 19212 bytes
SHA-256: b6a550537f875d9ec41b0acec385b40ccbfc0dd5b3e2b4db2abad49fa6a69366

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