Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b04f4e17130eb8…

MALICIOUS

PDF

41.6 KB Created: 2021-05-17 14:03:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 517c9621acc361d7db865ee4dfdd654d SHA-1: e1ade18cf0872db18116ca8bfc7661e84f60577d SHA-256: c7b04f4e17130eb81ca70be5765da89eefaaff13215eacbb6623cd01963458be
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 for 'free spins for coin master'. The embedded URL, https://netcdn.xyz/app/406889139/free-spins-for-coin-master-game-hack, directly supports this finding. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious workflow designed to trick users into visiting potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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/free-spins-for-coin-master-game-hack PDF link annotation
    • http://per-bittner.de/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://per-bittner.de/images/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://per-bittner.de/images/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • http://per-bittner.de/images/how-to-hack-coin-master-using-es-filer_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_off000049da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49DA 24376 bytes
SHA-256: 7ef988f672f922be85047b980cd3d4ef4769200cdc43752913485bc4149a0f32
font_01_sfnt_off00008180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8180 17884 bytes
SHA-256: 7a686c540965cac69e1923dfbb6a78ce3f92ec60dbbf6836da21cbb58cd4d6cc

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