Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9440fc74d25b6dc…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 09:45:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 213ff8b33b540baddb97b573ce8e5b6a SHA-1: c9affd8563e22ff0c8acce72eb40c69980f429b7 SHA-256: a9440fc74d25b6dca6392198d021da503b595aa69f782363fb54e7642394d98a
122 Risk Score

Malware Insights

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

The document contains numerous embedded URLs and a prominent call-to-action related to free in-game items, strongly suggesting a phishing or malware distribution lure. The presence of 'cmd_GM431946152.pdf' and 'minecraft-bedrock-edition-free_GM479516143.pdf' within the URLs indicates a potential attempt to trick users into executing commands or downloading malicious files disguised as game-related content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/406889139/free-coin-master-cards-game-hack PDF link annotation
    • http://www.library.smactf.sch.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-hack-roblox-with-cmd_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/minecraft-bedrock-edition-free_GM479516143.pdfIn macro / runtime command snippet
    • http://www.library.smactf.sch.id/repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/roblox-hack-apk-2021_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/e-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repositIn 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_off00002f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2D 22676 bytes
SHA-256: 770eb253f439085a262bffe41467a58dc6452c4b2c5fc366a62a632e488a2cbe
font_01_sfnt_off000061ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61EC 18172 bytes
SHA-256: 2fc47c4066dd28e3547f22ef08ec611cc49326c2517731f27ce49f34897b6455

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