Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b877480b6dac074…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 13:42:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fa9103f5f290affeda70b20402dc5a8f SHA-1: db476ea9819bb60c8132aa58b408a84019e82d8d SHA-256: 9b877480b6dac07468baa044756e13266aa8491ed57f2277c4fd1571748cd320
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to websites that promise free in-game currency or accounts, a common lure for phishing and scam operations. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/500-free-coin-master-spins-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-daily-free-spins-2021_GM406889139.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
stream_004_off00005220.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5220 24808 bytes
SHA-256: da1cf888ef0c8656465a8a810e38eeb3b51d16a0777d12e5342383626e3ff98a
font_01_sfnt_off00008bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC5 18192 bytes
SHA-256: fa9b97764db53bbdcb5733ef4c9d9cb3d8044f2b2a4eb4797e1cb3a317099c79

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