Malicious PDF — malware analysis report

Static analysis result for SHA-256 befa6e3dd1099e59…

MALICIOUS

PDF

34.6 KB Created: 2021-07-07 07:10:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2b5a4f02bbb49dc288292fc25478fb4e SHA-1: 13bb9f4c64ae2128e668db33d84fc50eebf664cc SHA-256: befa6e3dd1099e59bbb9bba5b20c103cacf30e07570ee066f1552fc11f0e065a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.tw/app/431946152/how-do-you-earn-robux-on-roblox-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/roblox-free-ss-excutor_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/como-hackear-los-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-buy-inspecting_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/iso-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/codes-roblox-hack-the-bank_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-girl_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-change-your-roblox-password-when-you-are-hacked_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-roblox-hack-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-no-wait-works-proof_GM431946152.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_off00002f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F89 22908 bytes
SHA-256: 786fbfa89eed3608b17131354d14763e714c98c68fb52df5ddec92e0b379e091
font_01_sfnt_off000061ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61ED 19120 bytes
SHA-256: 279645b1c0db0eac11f6ae93267d992a7d46986423d5a772a0510364adddd843

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