Malicious PDF — malware analysis report

Static analysis result for SHA-256 c533bdf8a4bb86b7…

MALICIOUS

PDF

48.2 KB Created: 2021-06-01 17:10:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a4171b842f41259d12844a50a39b4c1f SHA-1: 19b83cc402669bdc3a43e0a448496ae5cef05d43 SHA-256: c533bdf8a4bb86b7ee9cc2349338205b98bebfbf2ae61458f1afb4fa1f671dbf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising free Robux hacks and game cheats. The primary malicious URL identified is https://netcdn.xyz/app/431946152/www-free-robux-hack-game-hack. The document body, though heavily obfuscated, contains references to these lures and the malicious URL. The presence of multiple redirector links and the ML classifier's high confidence score indicate a deliberate attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://netcdn.xyz/app/431946152/www-free-robux-hack-game-hack In PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-hack-a-youtuber-on-roblox_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/hacking-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-money-roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/roblox-the-conquerors-3-money-hack_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/dev-console-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/promo-code-roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/someone-hacked-me-on-roblox_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-hack-people-on-roblox-easy-2021_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/roblox-name-changer-hack_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-downloading-games_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-coin-master-spins-and-coins_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
stream_004_off00005504.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5504 29560 bytes
SHA-256: b2499f451c95e910c220d0c1aca8c0d070d07b4990f8cd5fb56ffa805b38679c
font_01_sfnt_off000098c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98C3 18772 bytes
SHA-256: 39ff375c6e886295e3145046e237173f445d42cb7332f3ca96a34b2997a21050

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