Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc03b552108bb92…

MALICIOUS

PDF

34.7 KB Created: 2021-06-28 16:59:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4043c05a5664dd2c22f4f03dc3684f18 SHA-1: 576d78d263fbbfe9f7298a4db6339576a3d15726 SHA-256: fcc03b552108bb92adcf03682ccdde175e43bf64a65b27f0e9ba50d24675e554
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document body and extracted URLs indicate a lure for free Robux, a common tactic for distributing malware. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing on 'cmd-robux-hack-real-robux_GM431946152.pdf' suggests an attempt to execute commands, likely to download and run a secondary payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-no-survey-2021-working-august-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/free-bc-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/cmd-robux-hack-real-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/working-roblox-lua-c-welcome-to-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-account-and-password-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-icu_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-on-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-cheat-shinobi-origin_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/zombie-illuminati-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-get-robux-for-free-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumIn macro / runtime command snippet
    • 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_off00002eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EAE 21980 bytes
SHA-256: 05e347feab4a3ed1fd303df47cc4ef978c8d3a0abe2df36f0dd9c3c43c3717cb
font_01_sfnt_off00005f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8A 20004 bytes
SHA-256: b51b7aca6db7094a20329ece463ae9f5f36acca1d25bf78dfd7b1b963a3f7e46

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