Malicious PDF — malware analysis report

Static analysis result for SHA-256 39039b4e5ba06132…

MALICIOUS

PDF

35.5 KB Created: 2021-06-18 03:50:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 96a7fb850700eaf1ac73708c61bfdfc4 SHA-1: b753c040ca340d0d97037edc69652005fb5b9730 SHA-256: 39039b4e5ba061329e270e51f8be25e36ce406834299cb835a0d460a197a8bcb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free Robux' and game hacks. These links, such as http://netcdn.co/app/431946152/free-robux-hack-december-2021-game-hack, are flagged as malicious and part of a known redirector pattern. The document body and heuristics indicate a lure designed to trick users into clicking these links, likely leading to further malicious content or scams.

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-hack-december-2021-game-hack In PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-no-verification-no-survey-no-download_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-link_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-real_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/como-tener-robux-hack-2021_GM431946152.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-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/download-hack-roblox-adopt-me-money_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_off00003268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3268 22392 bytes
SHA-256: 11e733bda70466fa1148feeb07cde5879e4b7dd6b22af3592b8d51d591efd25a
font_01_sfnt_off00006471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6471 19528 bytes
SHA-256: 948e5d451ec3f424064ed8f680eaabf54ac4402781f1479b46833461254c7414

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