Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cbbcde647e19fc…

MALICIOUS

PDF

33.9 KB Created: 2021-07-09 07:21:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a728032dd08744d1a366087f79b435ab SHA-1: 392287658c7b0c3d7cc81fd59fdaea99305c906c SHA-256: b2cbbcde647e19fcefb3bb91308571be4de67bc2c07259dd4d84cd6081a0ed2f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and text that strongly suggest a lure for downloading game cheats or hacks, specifically mentioning "Coin Master Free Spins". The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of external URIs and the document's theme indicate an attempt to redirect users to potentially harmful content, likely for further exploitation or malware delivery.

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-free-spins-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/cool-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/rewardex-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-no-vertification-no-survey-no-pasword_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-roblox-clotyhes_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/hack-aimbot-roblox-gartis_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-your-hacked-roblox-account-back-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/xbox-roblox-free-characters_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/fly-cheat-2021-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-best-hack-for-prison-life-v2-0-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/google-moon-active_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-game-for-pc-free-download_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
font_00_sfnt_off00002fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB7 22556 bytes
SHA-256: 8ede33b90d683dae00490c019cba74aaeed7ec3cc27a470f8bbd5b1920e48897
font_01_sfnt_off000061f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F5 18176 bytes
SHA-256: c90cd52c690b3b1dd04b69356ad4f8db221968fb130a3d2ff71dcd50323a1a90

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