Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4834dcb48482cb7…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 23:36:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2172a651d83bc06c640dd72553fbba75 SHA-1: a6c021d1539be0881d4bd5e7cce4831a90e484bc SHA-256: b4834dcb48482cb7fa894d841ae8ef782398a0d3c192cca1dd69f567dd8b4bb8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to other PDF files hosted on a link farm. The primary URL suggests a lure for downloading a game, likely a social engineering tactic to trick users into downloading malware. The ML classifier strongly indicated maliciousness, and the presence of a "download button" heuristic further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/479516143/minecraft-story-mode-free-download-game-hack
    • http://perpustakaan.ipts.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/free-coin-master-spins_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/free-money-and-spins-coin-master_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/can-i-play-minecraft-for-free_GM479516143.pdf
    • http://perpustakaan.ipts.ac.id/repository/free-spin-link-coin-master-app_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/bux-life-free-robux_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/coin-master-free-spins-only_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-roblox-premium_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/multiplayer-master-hack-coins_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/fb-coin-master-free-spins-link_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/pokemon-go-free-83_GM1094591345.pdf
    • http://perpustakaan.ipts.ac.id/repository/free-spin-coin-master-hack-2021_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/free-spin-link-coin-master_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/minecraft-login-free_GM479516143.pdf
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/coin-master-free-spins-facebook_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052b8.bin
c674d0ac10fdd5889308c24efd20868d7a052dc2d43c6840fa5bcac04b7bbae9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52B8 25400 bytes
font_01_sfnt_off00008bfc.bin
b60985c1befe233451c1e4628b3545798255342bb86f0eafc92eb610c8c57488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFC 18468 bytes

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