Malicious PDF — malware analysis report

Static analysis result for SHA-256 319fcfdca725d05f…

MALICIOUS

PDF

48.0 KB Created: 2021-06-04 01:45:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b077e3402372fe7a688ef9a831a2a3ae SHA-1: b348b181f2a92dc748792ec0759c25988e5fbb33 SHA-256: 319fcfdca725d05fffaab0bcaf57aa0b3de3170d0ce00a264b8c5d4952629bdb
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document presents a fake CAPTCHA and a call-to-action button, strongly suggesting a lure for credential harvesting or MFA abuse. The embedded URL points to a suspicious domain associated with free rewards, a common phishing tactic. While no scripts were extracted, the PDF structure and heuristics indicate malicious intent to redirect the user to a potentially harmful external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 5

  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/431946152/free-robux-rewards-game-hack
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/master-coins-free_GM406889139.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/free-spin-link-coin-master_GM406889139.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/hacks-minecraft_GM479516143.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/how-many-levels-in-coin-master_GM406889139.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/is-there-a-free-version-of-minecraft_GM479516143.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/get-more-robux_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/free-minecraft-server_GM479516143.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/roblox-play-as-guest-free_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/free-robux-generator-no-verification_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/what-is-exploiting-in-roblox_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/minecraft-hacks-xbox_GM479516143.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/free-roblox-gift-card_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/get-free-robux-2021_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/coin-master-hack-program_GM406889139.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/roblox-sexually-abused_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/how-to-get-free-chest-in-coin-master_GM406889139.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/microsoft-bing-free-robux_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/free-custom-minecraft-skins_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000057f4.bin
56d01072ee7ee0edb83b38e528eb9063df5bd74d9aa4ec76ceb6763cce6e346a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x57F4 28740 bytes
font_01_sfnt_off0000985a.bin
f6e5d240c50f73aa936fa09c98082d3b637660329d811c3f0d463ac63f7ff7de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x985A 18580 bytes

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