Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ce9e6f105543cf…

MALICIOUS

PDF

49.2 KB Created: 2021-06-09 08:09:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: aeea6ef1271b8f0429837406cd25e3c2 SHA-1: b713a8a305f6bb8a4f2d994b5afb3ab66bf60978 SHA-256: 73ce9e6f105543cfd9bcf263f09d61c50be8ba727ce6d6b980d8e1dd53286123
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, a technique often used to redirect users to malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" lure further supports a malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to facilitate the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/www-we-hack-com-roblox-game-hack
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-without-human-verification-2021_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-generator-2021-no-survey_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id/repository/free-robux-pins_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-attack-hack-apk_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id//repository/how-to-get-minecraft-coins-for-free_GM479516143.pdf
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/free-spins-for-coin-master-hack_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/descargar-blackberry-roblox-hack_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-free-coins-link-2021_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/minecraft-sign-up-free_GM479516143.pdf
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-spin-link-app_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id//repository/how-to-hack-minecraft_GM479516143.pdf
    • http://perpus.poltekeskupang.ac.id//repository/no-human-verification-hack-for-coin-master_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-332-apk-free-download_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/free-robux-generator-2021_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-images_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id/repository/roblox-microsoft-rewards_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005176.bin
4da9c6bc216f3c9b3a8ad8e66062ddd2186196801e301986b3df28401f6659d3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5176 26888 bytes
font_01_sfnt_off0000907d.bin
e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634		 pdf-font-stream PDF embedded font (sfnt) at offset 0x907D 3500 bytes
font_02_sfnt_off00009c1f.bin
2d0758b66a3566f44a7edce60a502398628a2d87d785103d749cfbfa5738c610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C1F 18804 bytes

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