Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbd45c3ed0c200e…

MALICIOUS

PDF

47.2 KB Created: 2021-06-11 00:13:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c5da4fb7e1a9c54468c3beec73263113 SHA-1: b489c95344b0842a34181fac6b5de09ea70418e6 SHA-256: cfbd45c3ed0c200e6b68e2a09e7c7c2cbdfb59fe83eb3afb7f44ea750c0b42cd
82 Risk Score

Malware Insights

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

The document contains multiple embedded URLs and a prominent call-to-action, suggesting it is designed to trick users into downloading a payload. The heuristic for password-protected archives further indicates that the document is part of a multi-stage attack, likely to bypass initial security checks. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • 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 https://netcdn.tw/app/431946152/roblox-hack-robux-free-2021-game-hack PDF link annotation
    • http://librarystkippgribl.com//repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/hack-for-trasure-hunt-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/how-to-get-free-robux-on-roblox-2021-pc_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/impact-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-account-free-password_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f49.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F49 25512 bytes
SHA-256: bcde3793d404e644fc5f770afc68c04044f6d36fd6d58712c905745991ec3636
font_01_sfnt_off00008a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A16 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off000093b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B1 18888 bytes
SHA-256: 047121d8b4294f7e35048f9de096dbc513a3bf507975c143a56a3429993dfab9

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