Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda7c56d8d3e9de4…

MALICIOUS

PDF

33.3 KB Created: 2021-07-05 20:01:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3e4382dec17692e837ea433a065e06f0 SHA-1: 13842a1c8a6bf50792889357854227a73a3e4cf8 SHA-256: dda7c56d8d3e9de49410aa70c4be6a1f9bd0f8255cfb6fe0f4f9a68e227a3543
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to free game currency and hacks, directing users to a known malicious redirector. The embedded URL 'http://netcdn.tw/app/431946152/free-robux-without-verification-2021-game-hack' is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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-without-verification-2021-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-2021-yt_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/khaos-youtube-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/robux-gratis_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-gsg9-roblox-group_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-roblox-expoit-may-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-free-gear-items_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_off00002a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A42 22044 bytes
SHA-256: 83c01309d715e528e44e89e51d06becae1cf5b093b6136e71b07d06827e90378
font_01_sfnt_off00005b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B03 19840 bytes
SHA-256: b77f23397a098c4dc3ad9c6ed3599495bca59c8db3ab458779c0241217e21131