Malicious PDF — malware analysis report

Static analysis result for SHA-256 3355ae9c284dcc6a…

MALICIOUS

PDF

47.2 KB Created: 2021-06-04 03:54:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5ee116465b6b5d14d7e825a81d1baceb SHA-1: 019ec9528da85ac5e5495f4be813c40c5a63c4cb SHA-256: 3355ae9c284dcc6a5d2385fc82e6c2c8bbfeff5f11d1c17b319d8667482b3b75
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and numerous external links, many of which are SEO-optimized to appear as legitimate download pages for game hacks. The primary URL, https://netcdn.online/app/406889139/coin-master-hack-spins-and-coins-unlimited-free-download-game-hack, is likely the intended destination for users tricked by the CAPTCHA. The document's structure and content strongly suggest a phishing or scam attempt designed to lead users to malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.online/app/406889139/coin-master-hack-spins-and-coins-unlimited-free-download-game-hack
    • https://library.sman1berau.sch.id/repository/coin-master-hack-pro-gamers_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-hack_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/earn-free-robux-today_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/facebook-coin-master-free-spins_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/roblox-gift-card-for-free_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/coin-master-hack-app-ios-download_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/how-to-hack-people-on-roblox_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/coin-master-hacks-for-iphone_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/app-for-free-spins-on-coin-master_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/hacks-for-minecraft-bedrock_GM479516143.pdf
    • https://library.sman1berau.sch.id/repository/coin-master-34-4-hack_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/hack-coin-master-apk-2021_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/2021-free-spins-coin-master_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/free-robux-mod_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/free-robux-without-doing-anything_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/free-robux-generator-no-verification_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/coin-master-spin-cheat_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fe6.bin
358ce6901dd5bdd8520e32e089241cefa260873263571c3eb0485703e7141843		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE6 25332 bytes
font_01_sfnt_off000089ce.bin
30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89CE 2840 bytes
font_02_sfnt_off00009381.bin
3caa8a7d0fc813cf6f5b32cad2d70b7396c8f8504cee304b3b4cfd76b23e4d42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9381 19084 bytes

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