Malicious PDF — malware analysis report

Static analysis result for SHA-256 640b57c93f673b43…

MALICIOUS

PDF

34.5 KB Created: 2021-06-19 09:22:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5661558352e0ce249772d743769447ad SHA-1: aae95ab25d4b01fbe51b8a008249a203775932e2 SHA-256: 640b57c93f673b4353f77cfdee534d8ebbbebe3ebb0a05f0705686129bf02fe4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on domains related to academic repositories but contain game cheat-related slugs. The presence of a "PDF_SEO_LINK_FARM" heuristic and a high ML classification score indicates malicious intent. The document body and extracted URLs suggest a lure for downloading game cheats, which likely leads to malware execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/cheat-blok-piece-roblox-game-hack
    • http://perpus.ft.undip.ac.id/pustaka/repository/minecraft-for-free-on-phone_GM479516143.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/hack-minecraft_GM479516143.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/coin-master-hack-pc-free_GM406889139.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/all-game-roblox-admin-gui-hack-working_GM431946152.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/coin-master-free-spins-link-october-2021_GM406889139.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/original-roblox_GM431946152.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/free-limiteds-roblox_GM431946152.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/codes-to-get-free-robux_GM431946152.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/minecraft-bedrock-edition-pc-free_GM479516143.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/free-robux-no-verification-no-download_GM431946152.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/free-roblox-gift-card-codes-2021-september_GM431946152.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/how-to-get-free-robux-fast_GM431946152.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/minecraft-mod-updater_GM479516143.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/minecraft-redeem-code-free_GM479516143.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/free-spins-on-coin-master_GM406889139.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/free-coin-master-coins_GM406889139.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/coin-master-hack-2021-without-human-verification_GM406889139.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/coin-master-2021-free-spins-link-today_GM406889139.pdf
    • http://perpus.ft.undip.ac.id/pustaka/repository/coin-master-hacks-android_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f83.bin
2df4489e0dbccc1e34b506901336f8ea27ff9afb423213614554fb326c81ec5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F83 22460 bytes
font_01_sfnt_off00006196.bin
86eccd7bb8ea36da0e6c4fe61dcafe97410c21d58e1dd0fae17609a5a46de43c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6196 19200 bytes

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