Malicious PDF — malware analysis report

Static analysis result for SHA-256 784b5a85a29c9f0d…

MALICIOUS

PDF

41.8 KB Created: 2021-05-15 02:00:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8fe55d05ed9e28119c0124b3f0ee3a4d SHA-1: adefac1666db3560589c5d426def3bc90f2fff95 SHA-256: 784b5a85a29c9f0d5b8f4a8443d8df61c8b630d75fc03ed7360abcad552a80d1
122 Risk Score

Malware Insights

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

The PDF document contains a lure related to game hacks and free currency, presenting a fake CAPTCHA to trick users into clicking a malicious link. This link, 'https://netcdn.xyz/app/431946152/i-need-robux-game-hack', likely leads to a further stage of infection or a scam. The document's structure and embedded links suggest an attempt to exploit user interest in free in-game items to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/i-need-robux-game-hack PDF link annotation
    • http://avocatultau.eu/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://avocatultau.eu/images/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://avocatultau.eu/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://avocatultau.eu/images/free-minecraft-packs_GM479516143.pdfIn PDF document text
    • http://avocatultau.eu/images/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://avocatultau.eu/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://avocatultau.eu/images/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://avocatultau.eu/images/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://avocatultau.eu/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://avocatultau.eu/images/hack-robux_GM431946152.pdfIn PDF document text
    • http://avocatultau.eu/images/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://avocatultau.eu/images/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://avocatultau.eu/images/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://avocatultau.eu/images/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://avocatultau.eu/images/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://avocatultau.eu/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://avocatultau.eu/images/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://avocatultau.eu/images/i-robux_GM431946152.pdfIn PDF document text
    • http://avocatultau.eu/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://avocatultau.eu/images/minecraft-116-apk-download_GM479516143.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_003_off00004561.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4561 26264 bytes
SHA-256: a18c5c6a4754dc783f577569115a11424477e9c31228e4dcfb1bbe8fdc546e37
font_01_sfnt_off00008187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8187 18024 bytes
SHA-256: f1ec7b04fe7efc10da220c54b18b8286c95b0450e2bf9e35db279b0a74518d0c

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