Malicious PDF — malware analysis report

Static analysis result for SHA-256 c853a18ea6bf1104…

MALICIOUS

PDF

36.1 KB Created: 2021-07-07 22:53:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: aa3f1da387b950c5a6cfde3c4ca4880c SHA-1: 49859fe6c326a83d0f3c2764c57196701af8158b SHA-256: c853a18ea6bf1104f996222ce5e43f02607e9c90cf5aaebb3fe9813dfd0c04f1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.tw/app/406889139/coin-master-free-spins-link-download-hack-game-hack PDF link annotation
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/can-i-build-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/cb-ro-hack-roblox_GM431946152.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/roblox-brocken-bones-4-cheats_GM431946152.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/pastebin-roblox-account-hack-2021_GM431946152.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/free-gray-hair-accessories-roblox_GM431946152.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/free-easy-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/easy-free-robux-website_GM431946152.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/deineschuber-free-robux_GM431946152.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/coins-master-hacks_GM406889139.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • https://shop.mercurytekindo.co.id/ckfinder/userfiles/files/coin-master-free-spins-apk_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_002_off000033d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33D1 23308 bytes
SHA-256: 032710bb26c7f284fbc9eb5772cfeff6242f1b7f80405bdc8fe095e49d7d0c38
font_01_sfnt_off00006888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6888 18924 bytes
SHA-256: e987de95c71b54d77bff4d31366d2d96c0c1c0c84cc5d45c6fa9b96ee99b38ec

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