Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a444cc6f5fb3f2a…

MALICIOUS

PDF

44.7 KB Created: 2021-06-11 06:37:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1f34378aa9a1096210e4a0cc89a861fb SHA-1: 96eb3b8dcf11f5d4faf3731b36ec9b5fe06162b2 SHA-256: 7a444cc6f5fb3f2a0e001ddef3b40f0bdf2cea0ea4bb49ff986dd9a7e06fb259
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document employs a lure related to game hacks and free currency to trick users into clicking a malicious link. It displays a fake CAPTCHA or human verification prompt, which is a common tactic to encourage users to interact with the document. The embedded URL leads to a site offering game-related cheats, further reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-get-free-robux-in-1-minute-2021-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/earn-free-roblox-jailbreak-money_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-free-pants_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-follower-hack-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-daily-free-coins-link-today_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/do-you-get-windows-10-minecraft-for-free-with-java_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
stream_004_off0000509e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509E 24868 bytes
SHA-256: affb78d3a34db00568b8bd46bcd9d297b2140dea0e35eae21c7aad23a93b043c
font_01_sfnt_off000089c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C6 19000 bytes
SHA-256: 297e79581e19630d53c1a476f32280d85a4fdf071c66f642a83fac343bf4c401

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