Malicious PDF — malware analysis report

Static analysis result for SHA-256 144cfc9b35c2919b…

MALICIOUS

PDF

50.1 KB Created: 2021-06-08 17:29:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 47745c10345e561a704320efe11e99be SHA-1: ac42d34f2fb93f90a169ac1857e5ce0714107906 SHA-256: 144cfc9b35c2919b2e574b14eaa8b37424cb05af65229e6ce8e9b875fafce801
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are long-titled and appear to be part of an SEO link farm. The document also presents a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The primary URL points to a page about hacking Robux, suggesting a scam or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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.tw/app/431946152/how-to-hack-robux-with-cheat-engine-6.1-game-hack
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/free-spin-link-coin-master_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/how-to-make-a-free-minecraft-account_GM479516143.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/can-i-get-free-robux_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/coin-master-apk-hack-35-8_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/free-spin-coin-master-link-today_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/free-rare-cards-for-coin-master_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/coin-master-links-free-spins_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-accounts-passwords_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/how-to-get-hacks-on-roblox_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/roblox-wins-hack-boxing-simulator-2_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/microsoft-robux_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/coin-master-2021_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/free-minecraft-accounts-reddit_GM479516143.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/ac-market-coin-master-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054cf.bin
7dc2de6e924e35adf1d96402cbf892873949c0a0b462e5d175acde28d4c7767e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54CF 25504 bytes
font_01_sfnt_off00008ff2.bin
128a41eedfaa63f72c3e235bfd047ffd9c0c88893f3dfb4870db0666a1a6e764		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF2 4044 bytes
font_02_sfnt_off00009d1c.bin
b79fe82856cf36c82c487efd4487c2122a2bfdf2c1fb8afca2bf11dd34006fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D1C 19628 bytes

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