Malicious PDF — malware analysis report

Static analysis result for SHA-256 857d4d8829352fa2…

MALICIOUS

PDF

35.0 KB Created: 2021-06-30 11:26:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a093116dc90eac102b70783f82c12ee1 SHA-1: 143dafc3ccf9bff3a193ebe35199aadb1bb93bc2 SHA-256: 857d4d8829352fa2cfe758129178ebdafca986d58959894eea02a4876ace491a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.003 Windows Command Shell

The ML classifier strongly indicates maliciousness, supported by heuristics for external URI usage and a lure to execute commands via the clipboard. The document body contains multiple URLs, suggesting a phishing or scam attempt to trick users into downloading further malicious content. The presence of a visual download button reinforces this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/roblox-free-shirts-and-pants-girl-game-hack PDF link annotation
    • http://daskrimti-jabar.web.id/library/repository/only-free-robux_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/roblox-frost-guard-general-free_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/let-me-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/how-to-legitimately-get-free-robux_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/cm-spins_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/hack-roblox-command-prompt_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/get-free-robux-with-javascript-and-raw-paste_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/free-robux-no-hack-no-survey-no-human-verification_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/is-the-robux-hack-safe_GM431946152.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_off000030aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30AA 22488 bytes
SHA-256: aadfbfef106a1ec540568215ffbd6d969953fb0602e9a7181bfe63dfb9964db6
font_01_sfnt_off000062f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F9 19368 bytes
SHA-256: 9c0fff53f58518bdeb702f15a2fa466a703656cb0da9dd3c042e96403db8be6c

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