Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e60fc70c545dff…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 14:54:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: be9cee933e360fb286b46a25c46cd0de SHA-1: ab0f802637c929849277567d72cca0704ffbb4c7 SHA-256: 52e60fc70c545dff8ef34eb66d7669582fbd780372c77f5ed2433d17d06e1ad0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'hacks' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-rewards-free-spins-game-hack, which is identified as a malicious redirector. The document body and embedded URLs reinforce this theme, aiming to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-rewards-free-spins-game-hack In PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/weight-lifting-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/online-generator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/assassin-roblox-hacked_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/vortexx-roblox-free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/cheat-engine-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-without-downloading-apps_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_002_off00003164.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3164 22944 bytes
SHA-256: e145ef2f280aa10f71d87f38ac1ab5070f74915b1cb9d4e84780406aa2518b60
font_01_sfnt_off0000650c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650C 18512 bytes
SHA-256: 6bc66a7c9124691c5dbe04e2c8d08202ba1ceeb7f14ff76ef8eff16a4b1fabf8

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