Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8f3a0015be11a7…

MALICIOUS

PDF

48.4 KB Created: 2021-06-03 11:09:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: aa1bfd83b5a648788926422ce308c908 SHA-1: 95191f66ed9fde6892e8de5f50e67c816e97cb9f SHA-256: cb8f3a0015be11a7345d35511865533dd1008b62beb539b6b42767622b018c4d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary malicious URL identified is https://netcdn.online/app/431946152/how-to-get-free-robux-without-verifying-game-hack. The document body, though partially corrupted, also contains references to this URL and other suspicious links, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/how-to-get-free-robux-without-verifying-game-hack In PDF document text
    • http://elibrary.perludem.org//repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/rewardrobux-com_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-avatar-com_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-points_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/easy-robux-com_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f09.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F09 27628 bytes
SHA-256: ff33e057c26c9cf2f7495c5e8e882f120c19f507fbeab147278bc07093e45b53
font_01_sfnt_off00008d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D58 2824 bytes
SHA-256: 1d0cb1023eaa225682b8e7a2c8df4e4c96545ba7eedaf3d9844e51183e9ca189
font_02_sfnt_off00009705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9705 19368 bytes
SHA-256: 63de63cfc252acdf530e8b3b2390dbc20d855d9653817057ed506b48c41b68ab

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