Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdcb73fc8ff45dc…

MALICIOUS

PDF

47.3 KB Created: 2021-05-16 02:06:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 32e87cd36afb35e4b3c1657aa191ee77 SHA-1: 2de1ac5b2e46ea989371bcd009f221c4552372e7 SHA-256: bfdcb73fc8ff45dceca64c5753367218442bdfa280a1d7ca2c19593c5e55ec7d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'game hacks' and 'free generators' for popular games. The primary malicious link identified is https://netcdn.xyz/app/406889139/coin-master-apk-game-hack, which is flagged as a known malicious redirector. The presence of these lures and the ML classifier's high confidence score indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-apk-game-hack In PDF document text
    • http://stpc.it/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/roblox-18_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/roblox-free-items_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004929.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4929 25464 bytes
SHA-256: 2358d1bec9e8fde77af6df2e67a69a237fc9ffd71ad03efeeb66af11c5c0377e
font_01_sfnt_off00008311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8311 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_02_sfnt_off0000979c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x979C 17892 bytes
SHA-256: 60a225a48b1b678f90e38b10bd9e6f9d01ffb5102f34dbcee4b716dbf4a04973

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