Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7667e3b661ed55…

MALICIOUS

PDF

45.6 KB Created: 2021-05-18 00:34:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fc85f4dc2dc02b152350f5a43c05139e SHA-1: ac7196d1d712094a9b16dea43bbce2519c410abf SHA-256: 9f7667e3b661ed55a17e525f4daad6e5b484eab29ba8ddc1523ba6909202bfc8
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with a malicious link. The primary URL, https://netcdn.xyz/app/431946152/free-robux-without-doing-anything-game-hack, is embedded within the document body and also flagged by heuristics. This suggests a social engineering tactic to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.xyz/app/431946152/free-robux-without-doing-anything-game-hack
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/coin-master-unlimited-spins_GM406889139.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/coin-master-pc-game-free-download_GM406889139.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/roblox-promo-codes-2021-robux_GM431946152.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/coin-master-free-2021_GM406889139.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/free-roblox-hack_GM431946152.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/is-there-a-free-version-of-minecraft_GM479516143.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/free-robux-accounts-2021_GM431946152.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/tiktok-minecraft-hacks_GM479516143.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-2021-march_GM406889139.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/coin-master-100-spin-slot_GM406889139.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/coin-master-root-hack_GM406889139.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/apps-that-give-you-free-robux_GM431946152.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/7-year-old-roblox_GM431946152.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdf
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ea6.bin
50875c06eac6b741bcc531c7563d7900bfeb4eb81516ae6cd4077699e7fa6342		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA6 27376 bytes
font_01_sfnt_off00008d58.bin
e1e4d521198b5ef2bb2d2ba3e061f6fd747e7988b39df69dcb6ecbaf810b6a5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D58 19240 bytes

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