Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de6d5c4714faea4…

MALICIOUS

PDF

46.0 KB Created: 2021-06-09 00:57:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e64950fed9a65c70e12d4890e654e1eb SHA-1: a6b7c27f8a66e418d93a8bd75511a290213b8be8 SHA-256: 4de6d5c4714faea463c960f08247eaeb3fa59e136f401c47b0aa9ac056813974
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, that point to websites offering game hacks and cheats. The ML_NYX_PDF_MALICIOUS classifier also flagged the document with high confidence. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the links suggest a malicious intent to redirect users to potentially harmful content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/double-jump-roblox-hack-game-hack
    • http://librarysenior.com/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • http://librarysenior.com/repository/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdf
    • http://librarysenior.com//repository/free-roblox-premium_GM431946152.pdf
    • http://librarysenior.com//repository/free-robux-com-no-verification_GM431946152.pdf
    • http://librarysenior.com//repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdf
    • http://librarysenior.com//repository/coin-master-hack-mod-apk_GM406889139.pdf
    • http://librarysenior.com/repository/master-coin-free-link_GM406889139.pdf
    • http://librarysenior.com//repository/no-human-verification-hack-for-coin-master_GM406889139.pdf
    • http://librarysenior.com/repository/kachifpro_GM406889139.pdf
    • http://librarysenior.com/repository/free-coin-master-coins-2021_GM406889139.pdf
    • http://librarysenior.com/repository/roblox-toy-codes-free_GM431946152.pdf
    • http://librarysenior.com/repository/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://librarysenior.com//repository/robux-gift-card-free_GM431946152.pdf
    • http://librarysenior.com//repository/today-free-spin-coin-master_GM406889139.pdf
    • http://librarysenior.com//repository/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://librarysenior.com//repository/app-for-free-spins-on-coin-master_GM406889139.pdf
    • http://librarysenior.com/repository/apps-to-get-free-robux_GM431946152.pdf
    • http://librarysenior.com//repository/coin-master-free-spins-reddit_GM406889139.pdf
    • http://librarysenior.com/repository/coin-master-rewards-free-spins_GM406889139.pdf
    • http://librarysenior.com/repository/minecraft-java-free-trial_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000520d.bin
41acd7b1eb245b94bdd5080a803c30b067ff2838241f44868536a4be1f9c7765		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520D 26956 bytes
font_01_sfnt_off00008ecf.bin
fe7263558ad0b4112a5feb5667538a6685a1df185f1f304c709e301cccc00edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ECF 19092 bytes

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