Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4e270d7e97387e…

MALICIOUS

PDF

33.4 KB Created: 2021-06-30 05:13:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: df18b2297c3e8268d0761b10145d0b44 SHA-1: 7e73dec10ceeff0ccf25387d015d8776273ea6ea SHA-256: bc4e270d7e97387e677cd0f0cddbdf6b65320bf9a61bf7f68ed7a1a14fe490f7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document presents itself as a lure for game hacks and cheats, containing multiple embedded URLs pointing to potentially malicious content. The presence of a 'cmd-prompt' string within the document text suggests an attempt to execute commands, likely to download and run a second-stage 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-facs-roblox-game-hack PDF link annotation
    • http://dev.pmrscambodia.org/images/uploadfiles/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/simple-roblox-hack-hp_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-roblox-injector-v3rmillion_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-bear-cheats_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-long-are-you-banned-from-roblox-if-you-hack_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-headset-free_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-tix-and-robux-game_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/only-you-little-mix-cheat-codes-roblox-id_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-hack-roblox-jailbreak-with-cmd-prompt_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-free-coins-amp_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
font_00_sfnt_off00002e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E48 21944 bytes
SHA-256: 3f0bd0673261ac534c6a26b1d735069d22dc92c903e6488c252dc46d3b4b793e
font_01_sfnt_off00005ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC0 18652 bytes
SHA-256: 6b874b0ec6d72fdf43cb2114b5562e75975e75ca190a6c6a0ff3f24d3b25438b

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