Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c694500043facfc…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 14:36:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ea49dbf939d606b678389722f884a39a SHA-1: 7d3daa838f1f1ab2386ee86752b53296b589f584 SHA-256: 4c694500043facfcd783562efadec5228150f39519d8d86fc976f0de0036eb57
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free spins to entice users to click on embedded links. The primary link, http://netcdn.tw/app/406889139/coin-master-free-spins-a2z-help-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt, likely leading to further malicious content or malware download. The presence of a visual download button heuristic further supports this malicious workflow.

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/coin-master-free-spins-a2z-help-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-scam_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-a-person-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-no-human-verification-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hacks-para-infinity-anime-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/bux-today-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hack-roblox-accounts-download-file_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/app-hack-roblox-pc_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/easy-hacks-how-to-get-robux-without-buying_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-demon_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-windows-10-hacked-client_GM479516143.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_off0000303e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x303E 22892 bytes
SHA-256: af8bc71606c15aa9d94784a0bae267ea28ac6a99cb5ed708012a36a52740995a
font_01_sfnt_off0000639f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639F 18464 bytes
SHA-256: 38371b38e202a061bb85b2c2f3babff414a9c8e1a23fd0033143b7789bcb9fac

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