Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f2f7f21717df40…

MALICIOUS

PDF

45.9 KB Created: 2021-06-11 09:17:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b8b6fed5b6130eee293e538e2f376430 SHA-1: ddf17d1cb8250cf46c08763aef55370e9681b97a SHA-256: f8f2f7f21717df4006ff8879957930d43e832834a17079f91abfa84db79a656e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting a "generator robux free 2021 game hack". The document body and heuristics indicate a lure designed to trick users into visiting a malicious URL. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/generator-robux-free-2021-game-hack In PDF document text
    • http://repository.ummy.ac.id//repository/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-hack-roblox-on-mac-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-roblox-card-codes-unused_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/minecraft-windows-10-mod-menu_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/eastbrook-free-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/minecraft-mod-updater_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-hack-in-skywars-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.nrzroblox.comIn 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_off000051e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E2 26488 bytes
SHA-256: 9ef71a981b698ff446f6a2eaa07169e8fd7994bf05ff2022d2e468b3c171bf89
font_01_sfnt_off00008f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F84 18748 bytes
SHA-256: 022104d0fcbccba1a8e5ddbb447aa64cbe4a71cac58e69f7eaf45f3847de02ed

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