Malicious PDF — malware analysis report

Static analysis result for SHA-256 880177cd3fe90c7e…

MALICIOUS

PDF

44.5 KB Created: 2021-06-04 02:41:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4f0c22d22e55a6417f775c4e799a77a6 SHA-1: 3edd205e00bd72ea10c76a09f7cc9c18ce08995a SHA-256: 880177cd3fe90c7e124659fb69490d045a800228d6a4749f4e9deb1bb514a683
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It also embeds external URIs, such as 'https://netcdn.online/app/431946152/roblox-login-hack-game-hack', which likely lead to the download of a second-stage payload. The ML classifier strongly indicates maliciousness, supporting the observed social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/roblox-login-hack-game-hack
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-coin-master-spins-2021_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-email-rewards-link_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/minecraft-pocket-edition-hack_GM479516143.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-robux-groups-2021_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/pubg-uc-buy-paytm_GM1330123889.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/freespinandcoin-blogspot-coin-master_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-free-cards-link-2021-today_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-hack-version-2021-free-download_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/make-free-robux_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-free-robux_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/how-to-hack-coin-master-root_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-spin-coin-master-2021-link_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/how-to-get-free-shirts-on-roblox_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-robux-for-free_GM431946152.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-free-spins-link-2021-haktuts_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-fan-page_GM406889139.pdf
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/websites-that-give-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000516a.bin
36db691445ffc16a1b7e09ec6c7ddd6f65e345acd09c46650c31cf4530aada26		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x516A 24980 bytes
font_01_sfnt_off00008a6d.bin
4594c9d52aa6913ba89b547defae6e50b5d648d55ef93ab0faf484389542556d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6D 18592 bytes

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