Malicious PDF — malware analysis report

Static analysis result for SHA-256 984ffbfef3d29c24…

MALICIOUS

PDF

48.2 KB Created: 2021-06-11 11:31:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c1b704dde235a5d389d512fb8cff9375 SHA-1: 66198d94cc0575e64e5d1904f6e0ce12a14627a0 SHA-256: 984ffbfef3d29c24f9e6526aebdc44a404ee4f302dfccf2b8cb958ef6c73311f
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 users into interacting with a malicious link. The primary URL, https://netcdn.tw/app/431946152/how-to-make-group-in-roblox-for-free-game-hack, is embedded within the document and likely leads to a second-stage payload. The presence of numerous other suspicious URLs further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/how-to-make-group-in-roblox-for-free-game-hack PDF link annotation
    • http://www.pustaka.pn-calang.go.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-free-pants_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-to-make-anything-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/buy-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-hack-pizza-place-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-explosion-hack_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/exploit-to-use-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/wurst-115-2_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005265.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5265 24360 bytes
SHA-256: 97f7e5a9552aacb5860fb8c1222c6a89a8279286460bb28bc396b38350204b59
font_01_sfnt_off00008a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3E 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off00009765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9765 19020 bytes
SHA-256: c4a1d2d43c6e64319a45a2ca2fda8b27c4ad5dbda1180ea60dcda5405b4867e5

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