Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f25be04f66f6573…

MALICIOUS

PDF

34.2 KB Created: 2021-06-18 01:51:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3d85e55b5ab34d4df95f6bf3db9aa9e3 SHA-1: a4dd495884f9b6e33f41eb65ea30bb43b6d633bf SHA-256: 4f25be04f66f657391ff8fa1b88d1747067f33ffce06b9fc1adf4f33985c7c16
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as free game hacks and generators. The primary lure URL is http://netcdn.co/app/431946152/free-robux-limited-time-only-game-hack, which is likely used to deliver a second-stage payload. The document body and embedded URLs reinforce this lure, aiming to trick users into clicking through to malicious infrastructure.

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-robux-limited-time-only-game-hack In PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/roblox-mm2-free-weapons-exploit_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/roblox-hack-generator-no-download_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/roblox-tycoon-money-cheat_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/hacks-for-fallen-that-actually-work-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/cheats-for-roblox-pokemon-brick-bronze_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/new-roblox-sk9r-level7-hack-exploit_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-roblox-word-search_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/roblox-hack-how-to-see-peoples-inventory_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/hack-roblox-atravesar-paredes_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/money-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-robux-generator-no-verification_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_off00002f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F09 21860 bytes
SHA-256: caf93b6a9f34d1b6bc9b1d915320fbfaa2f657a1b0778bceac4dae8600adf88c
font_01_sfnt_off00005f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F64 19440 bytes
SHA-256: e2953490be4f6dadfde9efb3e9ff2fd49f7e2b641b35800a5492ac2ae76700f8

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