Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b4c398f14cbd77…

MALICIOUS

PDF

36.1 KB Created: 2021-06-25 10:53:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c7c40b395a69e2bbdf0a4b8fe8532024 SHA-1: 25e3136df607953608f00e8741a03a26d9e088b8 SHA-256: 06b4c398f14cbd77852c9d8ce8f23322ce0bd5adaacb5dd4db1878b5aa56dc35
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of 'free game hacks' to entice users to click on embedded links. The primary link, http://netcdn.co/app/431946152/free-robux-codes-no-survey-no-download-2021-game-hack, likely leads to a malicious site designed to exploit the user or deliver a secondary payload. The ML classifier strongly indicated maliciousness, supporting the analysis of the lure and embedded URLs.

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.co/app/431946152/free-robux-codes-no-survey-no-download-2021-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/robux-codes_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/pokemon-go-free-legendary_GM1094591345.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/earn-free-robux-robloxwin_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/pubg-uc-zarah_GM1330123889.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/cheat-codes-for-bea-simulator-on-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-spins-and-coins-from-coin-master-game_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_off00003317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3317 22364 bytes
SHA-256: 17bfd03d2d58f7f679a161bef330405409b017e24239cf95c6b78aa8a4f5fa03
font_01_sfnt_off000064f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F8 19992 bytes
SHA-256: 6d9df21f213c68c47efbc66cb38cb74e2c32c2346c4ea41e461dae4f6c3768ee

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