Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc1b41a15a2f7a0…

MALICIOUS

PDF

34.9 KB Created: 2021-06-19 01:05:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: daa45c342079cc19555c35b5bfd25267 SHA-1: 12594b43977c58ace38eddb6d827282d335e3e36 SHA-256: 3fc1b41a15a2f7a0260f1e956089de9857e94315a2d22ae226236bc13c1cab0b
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.co/app/431946152/robux-hack-mobile-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-robux-for-free-no-generator_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/is-there-an-app-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-bedrock-hacks-windows-10_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-shionbi-life-max-lvl-hack-robloxdaily_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-com-www_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-scam_GM431946152.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/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/www-coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-app_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-building-tools-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-daily-spins-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
stream_002_off00002fa6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FA6 22960 bytes
SHA-256: 7193089a1121e6d3b2a9a95c23652a86c7ff329aa836937d437fbfcab599225f
font_01_sfnt_off00006379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6379 19112 bytes
SHA-256: 5de44cba414809604b9b67e02fab88f158324715d178b889407ce238de258778

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