Malicious PDF — malware analysis report

Static analysis result for SHA-256 7332f97160400804…

MALICIOUS

PDF

46.4 KB Created: 2021-06-11 08:24:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e39202a72dce05ff8b24fde614a8abdb SHA-1: db5404f65db29a66249013c81611939cd8aac9aa SHA-256: 7332f97160400804328e7cb123681bfcab5e0bb13833ab2953da22e4db15a974
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external websites, many of which are designed to appear as download pages for games and cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier also flagged this PDF as malicious with a high probability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/free-robux-groups-2021-game-hack PDF link annotation
    • http://sbm-nn.ru/images/hack-roblox-dragon-ball-rage-android_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/granny-bring-all-item-hack-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-online_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-vip-gamepass-free-script-hack_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/artmoney-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54A1 26412 bytes
SHA-256: d99441ab18547647b6e12644affac60596967b4c75e9e6e9bbf66211f8a61b75
font_01_sfnt_off000091bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91BB 18592 bytes
SHA-256: 40c688a228a34b1cb0523430700763228a7eb04120cc8b5f4f4e5fd2bdb4007a