Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc61abd3157a3dee…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 00:37:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9ab769907f6d8df4965da315f7506e20 SHA-1: c765cab299dc9b6ca95010c657933abd93a4c18d SHA-256: cc61abd3157a3dee42843532d5c28123d77a1752fa3006039f52ee5c66805fd9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a 'download button' lure, strongly suggesting a phishing or scam attempt. The primary URL, http://netcdn.tw/app/431946152/how-to-get-free-robux-no-verification-on-combuter-game-hack, and the extensive list of linked PDFs indicate a link farm designed to redirect users to potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/how-to-get-free-robux-no-verification-on-combuter-game-hack PDF link annotation
    • http://digilib-ppsunisma.ac.id/repository/free-robux-clibait_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-no-subscription_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-free-coins-in-skywars-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-buy-robux-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-free-robux-august-14-2021_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/fly-hack-roblox-v3rmillion_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-hack-in-entry-point-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-hack-roblox-games-and-to-run-fast_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/game-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/focus-points-hack-roblox-dance-your-blox-off_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3078 21564 bytes
SHA-256: 178bb05c1b71e97caf4783cd3489d031e75c2adcb95febf1651bae4b9d293153
font_01_sfnt_off00005fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAD 19312 bytes
SHA-256: ba04658c7267e4e3607ed0ce397f1e8fc3a9acb0181e8fc13aa4d754f4e25d98

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