Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5528a97e5961726…

MALICIOUS

PDF

45.1 KB Created: 2021-06-10 15:03:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 86f3cd9105b344d813cf609dada3f386 SHA-1: c773ad80ef1ae5191d2a8341dfae75ebc6d873c5 SHA-256: a5528a97e5961726654aa9f28d7eca5e23c41f45e98086316286c464bececa23
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that are disguised as links to game hacks and free in-game currency. The primary lure, 'free-bc-on-roblox-2021-game-hack', strongly suggests a social engineering tactic to trick users into visiting malicious websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/free-bc-on-roblox-2021-game-hack PDF link annotation
    • http://sv-nahetal.de/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-local-player-script-hack_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/tiktok-free-views_GM835599320.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-co_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-hcbb-hack_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-sexually_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_004_off000051a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A4 26108 bytes
SHA-256: 9541f0bda7450216c08357a938ee37aa129baed2efe361af59b242721b4e14c2
font_01_sfnt_off00008d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D76 18352 bytes
SHA-256: aa4f208742d0001b47305ccee205b1a145a49bec60ff540cdac6872f8c225367

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