Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bc8e613454d46f…

MALICIOUS

PDF

42.9 KB Created: 2021-06-03 19:43:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5b282b8a3356e9a62119da67afac8f2d SHA-1: 535d9c85c55f06b6d8f9ba69cf24af43eec43d21 SHA-256: a8bc8e613454d46fa593c3d5fab96e959a5b0cdc41c7f9019952f62a7fe11879
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "game hacks" and "free spins" for popular games. The primary redirector URL is https://netcdn.online/app/406889139/coinmasterfree-game-hack, which likely serves as a lure to download further malicious content or lead to phishing pages. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.online/app/406889139/coinmasterfree-game-hack In PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-map_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-client_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-roblox-acc_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-tiradas-gratis-link_GM406889139.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
stream_004_off00004da4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DA4 25092 bytes
SHA-256: 00033a70dbc900acb807a94baa3ff504b692a90f27a9a41bc70d612e574e49fb
font_01_sfnt_off00008695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8695 17808 bytes
SHA-256: ed5fdd5441acd06a3bb02758ac945137dbfa7be696a0962169bf0eb95ec74bb8

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