Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad6638e21c46b97…

MALICIOUS

PDF

43.1 KB Created: 2021-05-11 18:35:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7bde4b21175f80783cf0d1fd46b97393 SHA-1: 2ff77e123550cc8c97828b526908725a07fc876f SHA-256: 8ad6638e21c46b971fd78b021a5b149b30eb557fd2591e1c96978e9b18b9cacd
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links and a prominent lure related to 'Coin Master Free Spins' and game hacks, directing users to external websites. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's designed as a redirector to game hack sites. While no scripts were directly extracted, the PDF structure and embedded links suggest a phishing or scam attempt, likely leading to further malicious downloads or credential harvesting.

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/coin-master-free-spins-link-game-hack PDF link annotation
    • https://vieclamjapan.com/upload/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-gold-cards-free-2021_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_off00004d60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D60 25368 bytes
SHA-256: cd7c123b6ca0d090d8932a8826cf940b2f2b32eb35d0dbf702d040f76b508f0a
font_01_sfnt_off000086bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86BC 18056 bytes
SHA-256: a4f33549350803e8a819cbfad6b4ff3cdc0b302ceab74af9f2f663eab6bd9ec0

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