Malicious PDF — malware analysis report

Static analysis result for SHA-256 d495ee3c51204bb9…

MALICIOUS

PDF

45.0 KB Created: 2021-05-12 16:08:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 73e3b1fea448eb0cd5df34e861274217 SHA-1: e6c4058618d5aac48a8b8a997ebed8e72b29722b SHA-256: d495ee3c51204bb977a945267237dac58a5e409f56e49a216702740979ca4a22
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm related to 'free Robux' and game cheats. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests that users might be instructed to download an archive and use a password, a common tactic to bypass security filters. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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.xyz/app/431946152/free-robux-websites-that-actually-work-2021-game-hack
    • http://library.thamrin.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/free-spin-coin-master-ios_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/free-robux-android_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/free-robux-group-payouts_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/coin-master-blogspot-free-spins_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/coin-master-free-rare-cards_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/how-to-get-minecraft-for-free-ios_GM479516143.pdf
    • http://library.thamrin.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/roblox-cheat_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/roblox-avatar-maker-free_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/free-robux-download_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/blox-fish-free-robux_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/free-spins-for-coin-masters_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/free-robux-no-apps_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/free-minecraft-account-and-password-generator_GM479516143.pdf
    • http://library.thamrin.ac.id/repository/how-to-install-minecraft-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dfb.bin
282c19abd3a70afd89ded796505c7ebf4b895e07902ff3c91e07be533c79ddfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DFB 25716 bytes
font_01_sfnt_off000089b5.bin
7b3ca8e33f6ab65cae0b12a773bae5d0e0377a7b1030ef9ec14be3c3cdd71d54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89B5 19656 bytes

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