Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81918d21c394294…

MALICIOUS

PDF

34.7 KB Created: 2021-06-22 01:46:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d9ef35431302e5e6d2887fb201e81662 SHA-1: 2e0c402912135882115db69bdc19bbd333ef886e SHA-256: a81918d21c394294124bb4be66e5db6733830351c6ecf0c8bd268ee0692676cd
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency and accounts, specifically mentioning 'Roblox' and 'Robux'. It includes a direct link to a suspicious URL that is likely a redirector for a scam or malware. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports a malicious intent to redirect users to potentially harmful content.

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-roblox-account-with-2021-robux-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-hack-roblox-without-a-app_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/elemental-battleground-roblox-hack_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/cheats-for-blodody-mary-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/games-in-roblox-that-give-you-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/safe-free-robux-no-password-or-human-verification_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-tool-2021_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_off00002e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E3A 22476 bytes
SHA-256: f02f21f4ab0eef57248847932869f823ff4e5fe702d91a14b38daf44d68de4c9
font_01_sfnt_off00006093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6093 19780 bytes
SHA-256: 9a38806f3faf3bcb0e3787dea793c548bd2e9f9fa6d32edfefd9e512e126ee87