Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a5a7127d429c84…

MALICIOUS

PDF

28.6 KB Created: 2021-07-09 01:55:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8bf170700dcd108356906859821da93c SHA-1: 217d05700973c1b957202b469b75e9ab9ac9e09e SHA-256: 88a5a7127d429c84d0cf67d728f06cbd5be9edee72e0afdb667f7af945e9fcab
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a link to a website offering a "Coin Master Hack Tool", indicating a social engineering lure for potentially unwanted software or malware. The ML classifier strongly flagged this PDF as malicious, and the embedded URI points to a suspicious download site. No scripts were extracted from this sample, but the presence of external links and the ML classification suggest a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 3

  • 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.
  • 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-hack-tool-v1-9-download-free-pc-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-island-royale-aimbot-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/create-app-like-tiktok-free_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/fre-robux-hacks_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/tiktok-free-quality_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/win-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-thumbnails-roblox-game_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/freecoins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/tiktok-unlimited-free-trials_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-roblox-with-ihax-games_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/www-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-18-9-hacked-client_GM479516143.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_off00002e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E79 22428 bytes
SHA-256: 9eb12dde5e278bdeb7ecf12e6dbd7c7c0b35acb0cea43a4f170bceaca246995d
font_01_sfnt_off0000609d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609D 3520 bytes
SHA-256: 7ed508ff7308a2f18b74570f27680b269892ee2ff4374484bae2059cb680065e

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