Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bb3ee80359c004…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 07:17:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 22eba73f2f5c1c6b7a6891b19448b486 SHA-1: e96223b64bae9249f40ce6c560ccd25df1c2c284 SHA-256: c9bb3ee80359c0041b28d73c83c5b39c06480b46c2d4f70128756a4f7dfff3e4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body, though heavily obfuscated, contains references to downloading Roblox and a URL that matches the heuristic. This suggests the PDF is designed to trick users into visiting a malicious site that likely serves a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/download-roblox-for-free-pc-game-hack In PDF document text
    • https://pustaka.widyakartika.ac.id/repository/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/pokemon-go-free-install_GM1094591345.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/earnrobux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-weird_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-free-unblocked_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
stream_004_off0000525f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525F 26708 bytes
SHA-256: c4ab888530aee783b4717ee612201f31b6ebfc02ecd9d8edbbd59ed107097c59
font_01_sfnt_off00008e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3B 18836 bytes
SHA-256: 92768d6fb7a5a0084ca72f2091e7afb90a576cd5884aa303e19bfb5ff4740e98

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