Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a3c3f5b2f543d4…

MALICIOUS

PDF

47.3 KB Created: 2021-06-11 13:14:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4f72a39c5fbfa5579c057986e6e36962 SHA-1: 6b25a4727645965d7ebb039e97d106bd85780a89 SHA-256: 84a3c3f5b2f543d45744de66436f47df6ec93874d251057f98f3dff80eadd414
122 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external PDFs, forming a link farm designed to attract users searching for game hacks. The primary URL, https://netcdn.tw/app/431946152/roblox-free-online-jail-break-game-hack, suggests a lure for Roblox game cheats. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/roblox-free-online-jail-break-game-hack
    • http://lib.fekon.untad.ac.id/repository/blox-world-free-robux_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/free-robux-on-phone_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/free-foxy-food-coin-master_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-spins-apk-2021_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/how-to-gift-robux-on-mobile_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-spins-blogspot_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/robux-in_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/coin-master-spin-hack-trick_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/car-dealership-tycoon-roblox-hack_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/how-to-hack-coin-master-computer_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/free-robux-generator-without-verification_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-spins-twitter_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/hack-coin-master-apk_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/roblox-arsenal-hacks-download_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/coin-master-apk-free-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f9e.bin
c30faba8e831e89cd1f9a4569d18ec297c90f0cf328e6b20e5d311c2c94bb778		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F9E 26324 bytes
font_01_sfnt_off00008b3b.bin
c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3B 2892 bytes
font_02_sfnt_off00009524.bin
0db3220bf81e4106aad75316531765cd6b63abd176a482b9df0c83f548665062		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9524 18632 bytes

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