Malicious PDF — malware analysis report

Static analysis result for SHA-256 773f3340d4b98823…

MALICIOUS

PDF

33.7 KB Created: 2021-07-06 14:44:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 263bc8c1137d06544d54e90267a92bf1 SHA-1: a98ad317ceb7c7d54205662248e19e61e7d017fe SHA-256: 773f3340d4b9882346692e8f0ec70f776e112f38d64df4d9937141171f7c9c58
82 Risk Score

Malware Insights

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

This PDF document contains multiple links to websites offering game hacks and cheats, such as 'Coin Master Free Spins Cheat'. The presence of a high-confidence heuristic for game hack redirects and numerous embedded URLs strongly suggests a phishing or malware distribution attempt. The document's primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-cheat-game-hack PDF link annotation
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-app_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-and-v-bucks_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hack-weg-machen-aimbot_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-candy-roblox-decal_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-pants_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-100-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-capes-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-robux-into-your-car_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-daily-spins_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_off00002dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DCD 22892 bytes
SHA-256: 218c5c17c1632d37814368a731f5641bfa516f725883a0ad7abcf95f11d9c5e9
font_01_sfnt_off0000611a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611A 18340 bytes
SHA-256: 31b040f11d31e2c25a3918167828aea55bdad87c8eae0a9348126ed232a1d2b9

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