Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc9edc3a759871d…

MALICIOUS

PDF

48.9 KB Created: 2021-06-10 20:58:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6cb8f317c3b12c123beac9fa5b741c0a SHA-1: c12109345ecdf0f3fa4d4e07c467c20268a7d98c SHA-256: 0dc9edc3a759871d27df2406c40882bf151fc96c52eebf857319917b5f4cc4eb
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a heuristic firing for a payment redirection lure, suggesting a phishing attempt. The document body, though heavily obfuscated, contains references to 'Roblox Promo Code Hack Robux Pastebin' and a URL pointing to a file related to 'free robux', indicating a lure for in-game currency. The presence of external URIs and a high ML classification score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 4

  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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/roblox-promo-code-hack-robux-pastebin-game-hack
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/get-free-robux-no-human-verification_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-2021_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-roblox-valentines-cards_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/is-minecraft-free-on-xbox_GM479516143.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-needs-password_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/roblox-premium-account-free_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-codes-no-verification_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/admin-command-roblox-hack_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/minecraft-free-no-download_GM479516143.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-coins-for-coin-master_GM406889139.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/minecraft-hacks-115-2_GM479516143.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-for-kids-under-18_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins_GM406889139.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/how-to-play-roblox-for-free_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/how-to-get-tiktok-famous-free_GM835599320.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/how-get-free-gear-on-roblox_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-avatar-roblox_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/how-to-noclip-in-roblox-with-cheat-engine-2021_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/get-free-robux-now_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005423.bin
660fa9c8fd7033191856f1db3f37051c87d85f61a1fb74b3e58e4ec6210b0848		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5423 31296 bytes
font_01_sfnt_off00009a5b.bin
f0a61d28184031c8000883fcdd057d9952aa7981d4ecb352d46ccfc416cb8783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A5B 19136 bytes

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