Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbdb11c1c1bb957…

MALICIOUS

PDF

48.6 KB Created: 2021-06-09 15:16:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c2dcaa695aede035cdaaddf3529ccee9 SHA-1: 23264dfe54e894809bd67db3250fd7704da4a57c SHA-256: cdbdb11c1c1bb957bc42b86793468965cbe076933e5b6dccc33bfc68089f2b8d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and text that mimic a generator for in-game currency, aiming to trick users into clicking malicious links. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs indicates an attempt to redirect the user to a potentially harmful site. No scripts were extracted, but the overall structure and content suggest a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/free-diamond-generator-roblox-royale-high-dark-wed-game-hack In PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/roblox-someone-hacked-my-account_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-roblox-exploits-2021-not-blocked-by-antivirus_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/cheat-engine-682-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000501c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x501C 25668 bytes
SHA-256: 113b6e6f1e23b4cbd1b4877cfdab9c960ea8bd51e711183e01eda75e36413018
font_01_sfnt_off00008af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF0 3276 bytes
SHA-256: 221af3300b5764bc393ae8846bd26de2692fec42067fffd606db4b56f399cbe8
font_02_sfnt_off00009643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9643 20004 bytes
SHA-256: e9e27200c8ec60a33fbd7d17b5bfbbe1d82d0758ff13af7ed70fa64a594fc2dc

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