Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb528773400ca920…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 12:26:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d324e2d8ca3c1c5f3bc419b3f01511ce SHA-1: 097d6caca3214f6952b7af44d7f5265c33122e00 SHA-256: cb528773400ca920b4f63fc83d2ba4e7dbc379c8e14099c3b3249ff81a02e343
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure for free game currency or hacks, specifically targeting Roblox players. It contains multiple embedded URLs, including a primary redirector at http://netcdn.tw/app/431946152/robux-free-co-game-hack, which is flagged as malicious. The document body and heuristics indicate a clear intent to redirect users to potentially harmful websites, likely for further exploitation or credential harvesting. No scripts were extracted, but the presence of numerous malicious links strongly suggests a phishing or scamming attempt.

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.tw/app/431946152/robux-free-co-game-hack In PDF document text
    • http://pustaka.fk.unand.ac.id/repository/www-roblox-com-catalog-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/btools-roblox-hack-2021-unpatched_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/bux-today-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-sir-robux-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/advexplore-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-roblox-uniform-templates_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/happymod-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-get-free-robux-hack-script-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-robux-games-that-work-no-password_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/hack-script-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-robux-club-com_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-cheat-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-money-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-robux-codes-forum_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-cheat-engine-63-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/is-it-true-you-can-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/i-hacked-into-someones-roblox-acout-there-password-was-pppppppp_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-deathrun-cheats-2021_GM431946152.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_off00003208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3208 22720 bytes
SHA-256: 71ec91b98b4a4b9111464bfc9e78ac8ac60f245c6ea32fe811eda30365b4abca
font_01_sfnt_off0000650e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650E 18716 bytes
SHA-256: 776cb4e5338264d595c967a8fec9379201c9a4b17293b3c44edd5cf6cd499e31

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