Malicious PDF — malware analysis report

Static analysis result for SHA-256 62171459df6971bf…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 19:31:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6ec0d1bc41f9a0d3d5ee60d2415ea00f SHA-1: 716ebab5448d647c211c536d58298adbd8116fa9 SHA-256: 62171459df6971bf5bc12e7cae782e6968c5965b481663355d4bd1d1b97b09a8
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector, disguised as game hacks and free currency generators. The primary lure URL is http://netcdn.tw/app/431946152/boku-no-roblox-quirk-hack-game-hack, which is designed to trick users into clicking through to potentially harmful content. The ML classifier also strongly indicated maliciousness, supporting the observed redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://netcdn.tw/app/431946152/boku-no-roblox-quirk-hack-game-hack In PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/multi-tool-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-robux-live-stream-every-5-seconds_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-restaurant-tycoon-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-r2da-hack_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-what-am-i-drawing-how-to-cheat_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-hack-tuts_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/freerobux-co_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-hack-roblox-carlos-admin-house_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-hacks-no-down-load_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-to-make-a-server-in-minecraft-java-for-free_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_off000032f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32F7 22708 bytes
SHA-256: 678ed42e588686af11912b092735215aa1982d77e8238dbb4b06e5613b45904b
font_01_sfnt_off00006571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6571 18888 bytes
SHA-256: 0e6cf7e966eefe1cf2a6ef285c46407b4d6ef89ff516d9fc89f18872bf19ca76

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