Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b31a3cac10e0bd…

MALICIOUS

PDF

43.9 KB Created: 2021-06-02 16:28:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 689509027e1407e7eec2c1dd4da96008 SHA-1: 6591eb61c2ae2eeb758debe97d3960aa65faaf16 SHA-256: 25b31a3cac10e0bd74c6d657bef65eee5ce544ae343aac4d6953590f4c504a18
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 and currency generators. The document body, though heavily obfuscated, contains references to these lures and the malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/no-robux-for-free-game-hack In PDF document text
    • http://sudamericarural.org/images/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/village-4-coin-master_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/roblox-free-pants_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-robux-hack-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
stream_004_off000051da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DA 24916 bytes
SHA-256: 38fbc6fb2d2c51bf6ca977f4e4a533d3f2b1c5b4c352170d0ca5f7032fec4a46
font_01_sfnt_off000089e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E1 18012 bytes
SHA-256: 617606119bf442f241917ef0bda1aa977480f8fd1bb89978bf8bba09b254fbc0

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