Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e0a2810eaa232f…

MALICIOUS

PDF

48.2 KB Created: 2021-05-14 13:01:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ac83911844dee21ac27ae5fbc6ee4339 SHA-1: de34c89bca5a4b953e543bba6ac9ee7656796265 SHA-256: f4e0a2810eaa232fc4c73329575d786650cf43b0e08ab2c3536e52e60fc236c5
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with a malicious link. The embedded URL points to a site offering "robux-gift-card-free-game-hack", further reinforcing the social engineering aspect. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/robux-gift-card-free-game-hack
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/free-minecraft-hacks_GM479516143.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/free-spins-coin-master-2021-no-verification_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/how-to-get-free-coins-on-flip-master_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/coin-master-heaven-free-spins_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/how-to-sue-roblox_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/roblox-free-robux-codes_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/robux-no-human-verification-2021_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/coin-master-fan-club_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/500-free-spins-coin-master_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/free-robux-obby_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/100-free-spins-coin-master-link_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/coin-master-hack-xyz-download-free_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/twitter-coin-master-free-spins_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/how-to-get-free-roblox_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/como-hackear-coin-master-iphone_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c7f.bin
4aab81654433e7a37e81d43c3962bdd887cd5d7a3c4f2a6d589fb728e6d0315b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C7F 29232 bytes
font_01_sfnt_off00008ecd.bin
02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ECD 2912 bytes
font_02_sfnt_off000098ca.bin
dc19c2dc7c571358abc7904f3409549de68542ff7a2dde77b507fd070c6276df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98CA 18640 bytes

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