Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b1161b9e5dff53…

MALICIOUS

PDF

51.6 KB Created: 2021-06-08 17:16:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cbc0d3f7b9df141417118bc5c7651d18 SHA-1: eda671439f0b232a3b38a6a822863b97b2511944 SHA-256: c4b1161b9e5dff5397ba0ce4c2a51726e2bce36a3e24b2439e01cc0a39507859
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a malicious website, identified as a 'free generator / game hack' lure. The ML classifier strongly flagged this PDF as malicious. The presence of multiple links to known malicious redirector infrastructure indicates a clear intent to lead the user to a potentially harmful site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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/how-do-you-give-somebody-free-robux-game-hack In PDF document text
    • http://digilib.stiki.ac.id/repository/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-hack-program_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-hacked-client-bedrock_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
stream_004_off00005321.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5321 36036 bytes
SHA-256: 92980dfd0998b81417a7d88c0835ef0de3e30f7045831bfc901d1259fb145a98
font_01_sfnt_off0000a45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA45C 19356 bytes
SHA-256: c4f3a2644858361057db92c09f54d6b26c13f07c3bd0344e83d125c133da3ce9

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