Malicious PDF — malware analysis report

Static analysis result for SHA-256 8143e6c67907f639…

MALICIOUS

PDF

34.9 KB Created: 2021-07-08 11:00:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3c91239ef41de0611b0e326a4084d5fa SHA-1: 116b41d9ecb4909781f28831c7d8eed34f6e0907 SHA-256: 8143e6c67907f63906ee1bb6a5d06190e92ff525c88eac6eaf236a5cf6ad1a0d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links and references to 'free Robux' and 'Coin Master hacks', indicating a lure to trick users into visiting malicious websites. The primary URL, http://netcdn.tw/app/431946152/free-unlimited-robux-game-hack, is flagged by heuristics as a game hack redirector. While no scripts were explicitly extracted, the nature of the lures and the embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-unlimited-robux-game-hack PDF link annotation
    • http://opac.stieimalang.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/roblox-wallhack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/game-robux-free_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/real-roblox_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-bear-face-mask-free_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/hack-server-roblox-script_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.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
font_00_sfnt_off00002f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F43 22688 bytes
SHA-256: ac89f6bf64b851458388e053c20219a0f40b034ff68c34e8c7717a3a7423b73a
font_01_sfnt_off0000626d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626D 19448 bytes
SHA-256: 12d77a38f0e0ba85876dc18b9bd1565f8e493343a18f7c01086cfc654b31b3f4

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