Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9aea4b8bce1cd3…

MALICIOUS

PDF

44.2 KB Created: 2021-06-07 09:55:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a3eeff63b98e8ce028a2b1b01f29bbde SHA-1: 1be5a91a4354585385a9ad8ed48bb88a8a37f268 SHA-256: cd9aea4b8bce1cd333ca595cab04ffcc3660e543eb89899649844b1f66affe23
162 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, with a primary URL pointing to a 'robux hack' lure. Heuristics indicate brand impersonation (Chase) and a security bypass instruction, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely leading to credential harvesting or a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/robux-hack-pw-game-hack.
  • 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/robux-hack-pw-game-hack PDF link annotation
    • http://kukuck.de/images/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://kukuck.de/images/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://kukuck.de/images/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://kukuck.de/images/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • http://kukuck.de/images/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://kukuck.de/images/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • http://kukuck.de/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/coin-master_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
stream_004_off00004feb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEB 24980 bytes
SHA-256: 146173d2c248167e8ad8924d963729b827285317ec616e3a268f052fe233a550
font_01_sfnt_off0000894f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x894F 18568 bytes
SHA-256: 41c14a9ebf641078823802b1e7bc50b7cdccfe6e616f6040a65bd58d74f007f3

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