Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b078f4bdf26c5e…

MALICIOUS

PDF

34.4 KB Created: 2021-07-09 18:39:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8d0eba4ccd796d92fb50e1c720efa41d SHA-1: 2b7bef831569a982f4a6fe7f4290bc45c212a5a6 SHA-256: b1b078f4bdf26c5e1e71df3cc7a95ae2b764ae6e71f5f756e570fb82f3176631
160 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a game hack redirector lure, directing users to the URL http://netcdn.tw/app/406889139/daily-free-spin-and-coin-game-hack. This, combined with other embedded URLs pointing to similar download lures, strongly suggests a social engineering attack aimed at tricking users into downloading further malicious content. The ML classifier also flagged this PDF with high confidence.

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/daily-free-spin-and-coin-game-hack In PDF document text
    • https://domc.tw/upload/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • https://domc.tw/upload/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/4-step-way-to-get-free-robux-2021-november_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/roblox-mad-city-hack-money_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-roblox-aimbot-in-every-game-for-mac_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/roblox-legends-of-speed-race-cheats_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-apk-mod_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdfIn PDF document text
    • https://domc.tw/upload/files/find-roblox-on-computer-hack-in-escape-from-the-demon_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/roblox-free-bc-codes-2021_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/blox-rewards_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-money-links-coin-master_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_off000030e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30E3 22284 bytes
SHA-256: 11f5a3f35697b15fc243a091851187d73de039ed329e7ed3c3a8d7eda77d4836
font_01_sfnt_off0000629c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629C 18664 bytes
SHA-256: b6449930c387aff5a3d9291f5267988411499284c7a33d11fc817d66e697c7e7

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