Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fc9a4784b5cc03…

MALICIOUS

PDF

36.5 KB Created: 2021-07-16 05:55:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 75470ee06fd0b53ff0d5b7341815e547 SHA-1: ced93e8150a9c69e02719ca0dcb4612ac184721a SHA-256: 78fc9a4784b5cc0366eaf741a1604c3325287b36fab03fffdb3521ec27a41232
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a prominent link to 'netcdn.tw' which is associated with free in-game currency lures. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

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/406889139/free-coin-master-spins-links-2021-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-you-dont-have-to-do-anything_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-gratis-funciona-hack-sin-cortes-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-rewards_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/supremacy-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-joined-hack-script_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-net-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-windows_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-real-robux-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox40com-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-parkour-hack-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_off0000375b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x375B 23296 bytes
SHA-256: ced06271065f53d0eb79407b2f7750c0ade4209fd0e727d7fd70838a6b42afea
font_01_sfnt_off00006bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC0 18456 bytes
SHA-256: 1df78224994ee43a22d89536079f46dbccffe913f4ec8075feb5eac5cb57a7db

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