Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21c895c0af22da0…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 21:13:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 648f96370b6175c8fa611e8dfeb95277 SHA-1: 59b4a384ad0de8cb5b72be598e781c3ac5aaa8d6 SHA-256: b21c895c0af22da0e7abf0bc7230ef1bb2eb3b7e34c8bdf1c9a619d037284e49
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting a 'game hack'. The document body, though partially corrupted, contains text related to 'Hack Coin Master' and a URL that matches the malicious redirector. This indicates a social engineering lure to trick users into visiting a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/hack-coin-master-using-cheat-engine-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-free-items_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-android-2021_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_off000053a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A3 26704 bytes
SHA-256: 211ab5a4c95b1fb0dd441ba9300f8be9566f5b98807521f8c5bfdafaca26e077
font_01_sfnt_off00009174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9174 18356 bytes
SHA-256: ed36b27b3f36e1d09c19690e7f017f96025b3159d1e0586fd8a26c5d6dd42277

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