Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c75a92b04821b7…

MALICIOUS

PDF

48.5 KB Created: 2021-06-09 07:07:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f69047375c81847ffbc6382016165302 SHA-1: 2938294ab12fafb96bafc556e69b4d829f9743f1 SHA-256: 66c75a92b04821b7974f902e2f365d22bd0052414f867ce80cb5082c148c8818
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA or human verification prompt, designed to trick users into clicking a link. This link, 'https://netcdn.tw/app/431946152/how-to-create-a-roblox-game-for-free-game-hack', leads to a website offering game hacks. The document body and embedded URLs suggest a lure for obtaining free in-game currency or cheats for popular games like Roblox and Coin Master. No scripts were extracted, but the PDF structure and embedded URIs indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/how-to-create-a-roblox-game-for-free-game-hack PDF link annotation
    • http://atiltd.com.tw/upload/files/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-support_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50EC 27332 bytes
SHA-256: eec9a80967bda402098b711784934ea10662cc503cd799030cf2fc63c33859ef
font_01_sfnt_off00008fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA2 2816 bytes
SHA-256: 4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
font_02_sfnt_off000099b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99B2 18704 bytes
SHA-256: 2af6af82502dbc61f5abd164a4b349d9390166635c95807913c0b0c9bb9fc17c

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