Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fba496382de3c55…

MALICIOUS

PDF

50.3 KB Created: 2021-06-11 05:50:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f148fd0ac2d7c373593df550f57f3062 SHA-1: 208fff5e96138168de9c8245128b65b2085a1f72 SHA-256: 5fba496382de3c5565dcbba48e23d897e140f72c4210366807b399815f0e0a01
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and document body text that are lures for obtaining free in-game currency or account recovery, suggesting a phishing or malware distribution attempt. The presence of 'cmd_GM431946152.pdf' in the document text and the ML classifier's high confidence further support malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/how-to-get-back-your-hacked-roblox-account-game-hack
    • http://perpus.smkn1pemangkat.sch.id/repository/how-to-get-free-robux-for-real_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/https-roblox-hackcom_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/roblox-free-robux-hack_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/free-spins-coin-master-app-ios_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/buy-free-hacks-now-on-roblox_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/free-robux-ad_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/free-spins-and-coins-coin-master-app_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/roblox-robux-hack_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/minecraft-free-unblocked_GM479516143.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/roblox-how-to-hack-accounts-with-cookie-editor_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/free-robux-hack_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/2021-roblox_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-free-coin-hack_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/coin-master-reward-link_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-free-spons-apk-2021_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/hack-roblox-chat-filter-cmd_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/coin-master-free-download_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/free-robux-microsoft_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/how-to-get-free-robux-app_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id//rep
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000537a.bin
d4bac148983947040341f76ec18d9921c48e2a23dc5a8bc4984352f3ef1143e5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x537A 27328 bytes
font_01_sfnt_off000092ff.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92FF 5696 bytes
font_02_sfnt_off0000a011.bin
ceb108c87af078a08543298ecc7d6365bb7c7dd4c8997d87a1960174736324fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA011 18924 bytes

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