Malicious PDF — malware analysis report

Static analysis result for SHA-256 16811c249a14c3c4…

MALICIOUS

PDF

35.1 KB Created: 2021-06-19 19:21:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e8f2911d7405e1cbf2bee3a7624ab879 SHA-1: 235901feb972ca26ce8b2046a1914bb1be2ec1fd SHA-256: 16811c249a14c3c435d2b577ee6cbb28e86e094689cbf4e37513298c2cb8a1ec
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a lure of 'free Robux' and game hacks to entice users. It contains multiple embedded URLs, including http://netcdn.co/app/431946152/free-robux-just-enter-username-no-verification-game-hack, which likely serve as redirects to malicious sites or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the observed lure and URL patterns.

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-robux-just-enter-username-no-verification-game-hack PDF link annotation
    • https://vierabyragazze.com/upload/files/free-girl-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-bubble-gum-simulator-steal-hack_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-team-deathmatch-map-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-roblox-toys_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-work-at-a-pizza-place-hack-script_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-the-plaza-money-cheat_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-daily-free-spins-link-today-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_off00003160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3160 22436 bytes
SHA-256: acb62df88ffd83d7d7f0f9437ce7dfa712b86da481f9058ad01377d063d65345
font_01_sfnt_off00006314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6314 19500 bytes
SHA-256: b1da4f69a4dbdc588c1e9f50b7edb1fa148f7ac7d069f7fee6d616558a00ca93

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