Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb9cb1be5e8560d…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 11:19:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 50de9e2babfc476207b8a10cace7f8c5 SHA-1: a75372c0244ea67d0f85a8afafcfc4e0f57fd6dc SHA-256: 2bb9cb1be5e8560d63d62c8626a4ee35d55532f75bb2a5d2f26712664a5db07b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free Robux and game hacks to entice users. It contains multiple embedded URLs, including a primary malicious redirector at http://netcdn.tw/app/431946152/free-robux-co-game-hack, which is designed to lead users to potentially harmful content. The presence of a visual download button further supports the malicious intent of directing users to external resources.

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/free-robux-co-game-hack In PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-shirt-templates-for-roblox_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-free-dominus-hat_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-hacker-typer-script_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-net-free_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-free-items_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/robux-free-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
font_00_sfnt_off00002f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F39 22116 bytes
SHA-256: 324b0f2917d8a8b95188f8602c92131f41920ffc97b2960daab1749ccf354746
font_01_sfnt_off00006077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6077 18716 bytes
SHA-256: ae86725dd70d168e8b5a24377d7effb3bd88f81667aa3e091abc0f5759eb354b

Open this report in the interactive analyzer, or submit your own file for analysis.