Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb62a027edd6a3f…

MALICIOUS

PDF

44.5 KB Created: 2021-06-07 09:04:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8200d1d6fc4f1c5c537ae5c594ca2616 SHA-1: 35ba832bc96d8c95b68dde2c8717003266428c75 SHA-256: aeb62a027edd6a3f2f617ced08f377f0206472e0de3b7f4ecd1301347bb7f148
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure for a 'free Robux generator' which redirects to a malicious URL. It also displays a fake CAPTCHA, a common social engineering tactic to trick users into performing actions that could lead to further compromise. The ML classifier strongly indicated maliciousness, supporting the analysis of the embedded lure and redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/gernrate-free-robux-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-offers_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-e-free_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-tiktok-coins_GM835599320.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_004_off00004fb4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB4 25916 bytes
SHA-256: 991076607be2eb15ae29fc0b22e9140db3b49b5b2a2905b89455300e244da791
font_01_sfnt_off00008b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B03 18344 bytes
SHA-256: 4f891b772903fe52551e9b8315d2bbd4be17b66ebf6473c69b5d619887ad00c9

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