Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ec5339585991f9…

MALICIOUS

PDF

44.7 KB Created: 2021-06-08 16:05:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e97427d18d40235d8dca9b019db9daa5 SHA-1: ad3cc9fba065783d161c320cc6b06acd39cc8572 SHA-256: b6ec5339585991f9824181797f601485ae7651555cf438eb60508357cabcb6b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, masquerading as game hacks or generators. The primary malicious link identified is https://netcdn.tw/app/431946152/free-robux-no-hack-no-survey-game-hack, which is designed to lure users into clicking through to potentially harmful content. The document body, though partially corrupted, contains references to similar lures, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/free-robux-no-hack-no-survey-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/hack-for-all-games-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-daily-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/hack-client_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d23.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D23 26932 bytes
SHA-256: 0307f8c7cd076c867e45cf0da92d0b5fe28ec4b912ccdf5dd11e0ca6a587c3fe
font_01_sfnt_off00008ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD2 18704 bytes
SHA-256: be6d9ce0a4a637734f4f0ccc7d0d51cc8e6ac0717f65e51cefbbab0366922f91

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