Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8bb382a6354efe…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 11:06:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 818fe335215ad7004a947ddcab64a0b6 SHA-1: bea4ea21a9734a8f5050e40e6e5cb5171be8bf53 SHA-256: 3a8bb382a6354efe9c75f20cfa94da85ee6fbd1ca0f7bdf246424eb8b36ec4b8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and text that lure the user into downloading a "hack" for the game Coin Master. The primary malicious URL identified is https://netcdn.online/app/406889139/coin-master-35-13-hack-download-game-hack, which likely serves a second-stage payload. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/coin-master-35-13-hack-download-game-hack In PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-spins-cheat-deutsch_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/pubg-uc-voucher-redeem_GM1330123889.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/robux-hacks-2021_GM431946152.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_off000051b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B5 25728 bytes
SHA-256: 4185dd9a7c98c6fc9474614df2477e9825a6741cf246b0193ccc2a1847912779
font_01_sfnt_off00008c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C96 18708 bytes
SHA-256: 93ce08747d3de473b76e6888fe87781506bf53a72845462e0168465878d5da7e

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