Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b77c13f19b4e2a…

MALICIOUS

PDF

33.8 KB Created: 2021-07-04 12:26:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8adf975cde52f3aae23271607995826d SHA-1: da0d9c628b5801035d96c301e8934e66ee6aa129 SHA-256: d8b77c13f19b4e2a9fb147da78ab544bf2c957fff201dfe0bf2b6eda250ae470
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and text that promote free in-game items and hacking tools for popular games like Coin Master and Roblox. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to redirect the user to malicious sites. The document body, while containing some obfuscated data, clearly references hacking and free game-related content, indicating a lure for potentially unwanted or malicious downloads.

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/431946152/games-that-can-be-hacked-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-free-robux-pins_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/get-free-obc-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-purchase-robux-for-free_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-free-download-linux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-app-download-free_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_off00002efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EFB 22048 bytes
SHA-256: afd508bcbda1ed824b853362516433d3d72f49ca2980a486f5b88618a3077cc6
font_01_sfnt_off00005fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBC 18776 bytes
SHA-256: c043326b32e9d44158bac6e99eb248c2f97816695cbd5054f46ff6cdd58d7864

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