Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a8b230409f0779…

MALICIOUS

PDF

46.0 KB Created: 2021-05-12 10:38:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0f2511d3ce40208644445f70700ae40e SHA-1: d7bdd2b6b8d7edcf3a1ee3eaeb98800d9e3120b6 SHA-256: f8a8b230409f07795d97c847eafed52b739d5ddf2fd02887c886cb34cd840795
62 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and a visual call-to-action, strongly suggesting a phishing or social engineering attempt. The primary URL, https://netcdn.xyz/app/431946152/can-u-get-free-robux-game-hack, indicates a lure for game-related cheats or currency. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/can-u-get-free-robux-game-hack
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-robux-com_GM431946152.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/ear-free-spins-for-coin-master_GM406889139.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/open-coin-master_GM406889139.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/static-moonactive-net-rewards-2021_GM406889139.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-robux-accounts-2021_GM431946152.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-coins-coin-master-iphone_GM406889139.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/coin-master-hacking-news_GM406889139.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/coin-master-apk-mod-free-download_GM406889139.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/where-to-get-free-robux_GM431946152.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-spins-for-coin-master-app_GM406889139.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/roblox-font-free_GM431946152.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-robux-codes-2021_GM431946152.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/minecraft-hack-client-18-9_GM479516143.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/roblox-robux-generator-2021_GM431946152.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/avatar-the-last-airbender-roblox_GM431946152.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/how-do-you-earn-robux_GM431946152.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/hack-coin-master-apk-download_GM406889139.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/bux-life-free-robux_GM431946152.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-robux-instantly_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049c0.bin
3b1209f137ba272e1904d037524f5779ac2c266c544f9136c261bf4d070e6fc5
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C0 31856 bytes
font_01_sfnt_off000090ca.bin
35bb0f01f69d1b5e790ed5f4c0eeb98998139975dc1eb58b588dc01b9002bbc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x90CA 18532 bytes