Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97ca0a5b95aa7b7…

MALICIOUS

PDF

45.4 KB Created: 2021-06-11 12:50:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1b2a5aaf7dff31dd1b2da3e8eb969cd9 SHA-1: 90f4ee6fedee7024fc3a36006dbb702db4229f29 SHA-256: b97ca0a5b95aa7b7cb1107b8ae3fb0850e2e36107772ea7b1f145cb3ec9064e7
82 Risk Score

Malware Insights

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

The PDF document contains a lure for 'Free Robux' and presents a fake CAPTCHA to trick the user into interacting with a malicious link. The embedded URI points to a suspicious URL, likely intended to download a second-stage payload or redirect to a phishing site. No scripts were extracted, but the presence of a fake CAPTCHA and external URI strongly suggests a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/free-robux-c-game-hack
    • http://perpustakaan.sman2bondowoso.sch.id/repository/how-to-hack-roblox-exploits_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/robux-free-roblox-glitch-2021_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/free-spins-for-coin-master-game_GM406889139.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/robloxheroxyz-free-robux_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/robux-money_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/free-robux-hack_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/free-robux-without-verification-2021_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/free-coins-coin-master-haktuts_GM406889139.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/free-robux-hack-mobile_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/blox-world-free-robux_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/free-robux-website_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/coin-master-hack-tool-2021_GM406889139.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/roblox-free-items-2021_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/roblox-promo-codes-free-robux_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/how-to-stop-roblox-from-crashing-when-hacking_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/roblox-website-robux_GM431946152.pdf
    • http://perpustakaan.sman2bondowoso.sch.id/repository/coin-master-spins-and-coins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000533c.bin
0cc6807b3146309bf1012a8dc8e765a357a1cc75f605e2892d97f39599c20767		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x533C 25964 bytes
font_01_sfnt_off00008f9f.bin
3ef9e48aa3d97d4217e004f7625a8cbae9320a74231b80a01553f6433e422360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9F 18012 bytes

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