Malicious PDF — malware analysis report

Static analysis result for SHA-256 8577c0ac835c9db5…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 11:08:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0aac86fc40b5740e88ddad7cd737b3b8 SHA-1: 9fe5d3b2515ef4c135d3d57d6a78f50c8f8a13d3 SHA-256: 8577c0ac835c9db540b9c2e59008e38d2f2dadc6b13fdbf0842fd882bc43e6d0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, many of which are hosted on educational domains but appear to be part of a link farm. The document body and heuristics indicate a lure for free Robux and Roblox game hacks, directing users to download potentially malicious files. The presence of 'cmd_GM431946152.pdf' in the document text suggests an attempt to disguise malicious commands or executables as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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 http://netcdn.tw/app/431946152/roblox36com-free-robux-game-hack
    • https://perpustakaan.smp1madiun.sch.id/repository/roblox-hack-bloob_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/someone-hacked-my-account-roblox-how-to-get-robux-back_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/how-to-hack-roblox-accounts-using-cmd_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/dbz-rage-roblox-hacks_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/free-robux-roblox-promo-codes_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/how-to-hack-robux-inspect_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/fly-hack-roblox-weight-sim_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/how-to-go-fast-with-roblox-hacks-on-vehicles_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/how-to-get-btools-on-roblox-with-no-hacks_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/free-roblox-accounts-2021_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/roblox-free-no-install_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/did-biggy-get-robux-free_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/how-to-hack-digimon-aurity-roblox_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/free-roblox-items-to-sell_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/descargar-hack-para-roblox-dragon-ball-rage_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/nbc-roblox-free-accounts_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/free-premium-roblox-accounts_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/what-are-some-websites-to-get-free-robux_GM431946152.pdf
    • https://perpustakaan.smp1madiun.sch.id/repository/minecraft-name-tag-hacks_GM479516143.pdf
    • https://perpustakaan.smp1madiun.sch.id/r
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e6a.bin
3c319b052666d14b39755bee8863ea0c2fa4af65d30a88a7df41088936beff30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E6A 22680 bytes
font_01_sfnt_off000060f1.bin
f5d8fb1e1227d04f94fc2588cf3bb8579c3297dc080a6331d916c9c738f57d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F1 19392 bytes

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