Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ac72adf5666b78…

MALICIOUS

PDF

34.2 KB Created: 2021-07-02 03:14:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0f1f5494676b01e34aa09248e75a4fa7 SHA-1: 6af7e0b634c42827eeb55e5e056b3cd6925c0647 SHA-256: e4ac72adf5666b781ccab71292320e490931bb2c7d25ef5f9f57efae2e1ce647
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and free generators. The primary malicious URL identified is http://netcdn.co/app/431946152/client-cheat-roblox-game-hack. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to trick users into downloading further malware.

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/client-cheat-roblox-game-hack In PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-roblox-redeem-codes-11-2-16_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/wild-savannah-roblox-how-to-change-colours-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-free-robux-plugin_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/https-oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-stylish-animation-pack-free_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-hack-a-roblox-account-quick_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/hacks-for-action-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/assassin-2-roblox-hack-khnif_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-website-not-a-scam-or-fake_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/getrobux-now_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_off00002ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF4 22528 bytes
SHA-256: 367d76566eca097d2a551ef4d4ca4e185b911f385fd3cc6d18250a32798b4a4d
font_01_sfnt_off00006111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6111 18876 bytes
SHA-256: d068a066de618b5a91d8dc94ecb6242c87246dd266554911326a1c13ed30f650

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