Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db3bbe24b54f8d5…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 15:44:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 821c0426458157b907c5d1e6f4352a52 SHA-1: b501fdc3627955782266e65f442066566b6fb5e4 SHA-256: 1db3bbe24b54f8d565e2227d6b70d6d1568bcd26616555e08eb977d1ac882571
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game currency or hacks. The primary redirector URL is http://netcdn.tw/app/406889139/free-400-spins-coins-master-game-hack, which is designed to lead users to potentially harmful content. The document's structure and embedded URLs suggest a social engineering tactic to trick users into visiting malicious sites, likely for further malware delivery or credential harvesting.

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/free-400-spins-coins-master-game-hack In PDF document text
    • http://thamelinn.com/userfiles/files/ajc-rome-tech-free-roblox_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/earn-free-robux-for-roblox-robloxwin_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-hack-assassin-roblox-2021_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-tiktok-likes-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/roblox-sued_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/pokemon-go-free-and-home_GM1094591345.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-spins-coin-master-links-no-human-verification_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_off000030d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D0 22904 bytes
SHA-256: 0ecc2187c44bc0d9999d07de81416cdf3fc9410f12cc71acb30eec9c6f465ecf
font_01_sfnt_off0000644b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x644B 18408 bytes
SHA-256: 4e66a57bfe738047e6df63fd9189a21fbdddd8af32605bc7d5792be520b928d4

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