Malicious PDF — malware analysis report

Static analysis result for SHA-256 856dc468a21a9bb5…

MALICIOUS

PDF

34.7 KB Created: 2021-06-26 04:10:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 38a7990e13f3b7e009276fd091d720d4 SHA-1: a69abb19a8bf0ab3fc6055e02a4de50cc3a4e9b5 SHA-256: 856dc468a21a9bb58ac8820393000ea2806fc49630ca857635ae23d2e7013a5b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to free game currency and hacks, directing users to a known malicious redirector. The embedded URL http://netcdn.co/app/431946152/free-unlimited-no-wait-robux-game-hack is associated with malicious redirector infrastructure. The document's content and structure strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/free-unlimited-no-wait-robux-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/hack-roblox-counter-blox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/can-i-have-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-sued_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-xyz-apk-download_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-daily-spins_GM406889139.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_off00002f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F88 22224 bytes
SHA-256: a904c718afe95688445589c3d12e6bcaf27079c20d87aa5bb7067a650648ba3a
font_01_sfnt_off000060ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EA 19648 bytes
SHA-256: 9a575b9b685281999961e258190f6654105f41e18405a992c7bfa14fb9d0950e

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