Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55ce362639c3b38…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 15:45:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cc1485a6cc3ed62911f9a138058535ed SHA-1: 331605adc0c6c11d24872db6ac77d53a9262c679 SHA-256: d55ce362639c3b386dec107e15660c4a4fef9f35b9df2b15f1cf70aa0e7b673f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising free game hacks for popular titles like Roblox. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the heuristic firings indicate a social engineering lure designed to trick users into visiting potentially harmful websites, likely to download malware or engage in credential harvesting.

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/play-robloxcom-free-game-hack In PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/lvl7-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/teleport-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-super-power-training-simulator-hack-download_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/robux-hack-no-download-apps_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/hacker-mask-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/is-tiktok-free-on-android_GM835599320.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-robux-2021-december_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/robux-premium_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/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_off00002efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EFB 22788 bytes
SHA-256: 44c8a663df28b333b892bd41ed3cade7370ee177bebfca8550a77ec51a0264ec
font_01_sfnt_off000061f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F0 19244 bytes
SHA-256: 0e61e31d4f0392abdb9fb508085995064388bc4d22a3b79051b7eaa7adfd4faa

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