Malicious PDF — malware analysis report

Static analysis result for SHA-256 c934cebe4e5f4aa0…

MALICIOUS

PDF

48.6 KB Created: 2021-06-09 16:18:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 221e06d5a608605923a89bf8b75755bb SHA-1: 232021c02f26e06726652d46bb91dd6802fe829d SHA-256: c934cebe4e5f4aa0bd5f3962a4cc241c5c9ab6f707ce55a12612f1baa15cd8dd
122 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'game hack' and presents a fake CAPTCHA to trick the user into clicking a link. The embedded URL leads to a site offering a 'hack executor' for Roblox. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to facilitate the download and execution of potentially malicious software, likely through a JavaScript exploit or by prompting the user to download an executable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/hack-executor-roblox-game-hack PDF link annotation
    • http://aeridefense.com/image/data/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/win-free-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/wurst_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-tiktok-followers-and-likes_GM835599320.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.roblox.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f26.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F26 27688 bytes
SHA-256: 4e01e3b6e1c955f0e201b6b15868ba263e2ffe0c637b12bd27c08d52c5b9d28f
font_01_sfnt_off00008d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6B 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off00009a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A92 18428 bytes
SHA-256: f02a64af1e7ceb12b3975d592034532ec24e00950a991490826121d4c0b6491b

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