Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dc492520516d7a…

MALICIOUS

PDF

43.6 KB Created: 2021-05-16 08:00:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e366e6c62f7d22d4e4cddc4333b4f9a2 SHA-1: 8159319bd4018f3c147aaf3ee2dd265305ab1ff0 SHA-256: 85dc492520516d7ac7fb049a25cc4914b1cdd244d019a07ee98ce5c6ed60d686
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a clear lure for free Robux, a virtual currency, and includes an external URI pointing to a download site. The document body, though partially corrupted, contains text related to 'free Robux' and 'no human verification', reinforcing the phishing attempt. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/free-robux-no-human-verification-or-survey-2021-game-hack
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/minecraft-menu_GM479516143.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/robux-place-rewards_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/hack-coin-master-game-download_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/minecraft-free-online-unblocked_GM479516143.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/www-free-robux-com_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-minecraft-capes_GM479516143.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/robux-generator-without-verification_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-spins-coin-master-site-wwwquoracom_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/coin-master-hack-download-apk_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-robux-not-a-scam_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-robux-codes-2021-not-used_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/roblox-script-executor-free_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/hack-coin-master-android_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/coin-master-hack-app-android_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a41.bin
8b33de17afb278570a1cf34b7b28d69bd290ea633fc10e9dc2b865fe1382ad8c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A41 25276 bytes
font_01_sfnt_off00008418.bin
08b2a18d96b3566ec838f0e87c4bb916e955b8f8af04b9064418114d078945b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8418 19556 bytes

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