Malicious PDF — malware analysis report

Static analysis result for SHA-256 474abec6dcf7e16a…

MALICIOUS

PDF

48.6 KB Created: 2021-06-08 08:55:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ba83f13216400418dececeba0a7794bb SHA-1: 8bfe0d9069e0e322942ba58119dee894da8f2ef0 SHA-256: 474abec6dcf7e16a7525e3971bae06a90d91d4b2b30f936cc400aeefed28a69d
122 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, many of which are disguised as game hacks or generators for popular games like Roblox and Minecraft. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of a fake CAPTCHA prompt strongly suggest a malicious intent to trick users into downloading further malware or engaging in fraudulent activities. No scripts were extracted, but the embedded links are the primary indicators of compromise.

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/how-to-get-a-free-2021-2021-roblox-account-game-hack PDF link annotation
    • http://legs11.co.za/images/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/free-robux-cards-2021-november_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/robux-free-c_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/roblox-free-minigames_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://legs11.co.za/images/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/free-items-you-can-get-in-roblox_GM431946152.pdfIn 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_off00005484.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5484 25480 bytes
SHA-256: be2eb01e4175dda59af1aab2ca4cd994ff6d672c798b73df7b6b666c2390e15f
font_01_sfnt_off00008f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8C 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off00009989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9989 18756 bytes
SHA-256: e140c160b854e48c94d23fc2056235697a669b3d5080d4f483669855d1e6e67b

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