Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56c2d44c368ef73…

MALICIOUS

PDF

45.5 KB Created: 2021-06-08 10:13:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a5ac845c1f1a16ccc8834ae46f499d4d SHA-1: 79aa7e18d97ab1a5a905e1ae7b05bc9cdf2879b8 SHA-256: f56c2d44c368ef73b7d153194e40b869dcc23510cb0d625835ec73d2c204cbff
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, identified as a link farm, designed to lure users with promises of free in-game items or accounts. The ML classifier strongly indicated maliciousness, and the presence of a 'download' button heuristic further supports a malicious intent to redirect users to potentially harmful sites or download further payloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/roblox-games-202120213-free-robux-roblox-game-game-hack
    • http://grupodin.com.br/images/free-minecraft-server_GM479516143.pdf
    • http://grupodin.com.br/images/free-spins-for-coin-master_GM406889139.pdf
    • http://grupodin.com.br/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • http://grupodin.com.br/images/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdf
    • http://grupodin.com.br/images/minecraft-hack-2021_GM479516143.pdf
    • http://grupodin.com.br/images/minecraft-free-download-unblocked_GM479516143.pdf
    • http://grupodin.com.br/images/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://grupodin.com.br/images/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • http://grupodin.com.br/images/how-do-you-download-minecraft-for-free_GM479516143.pdf
    • http://grupodin.com.br/images/best-free-spin-app-for-coin-master_GM406889139.pdf
    • http://grupodin.com.br/images/roblox-promo-code-to-get-free-robux_GM431946152.pdf
    • http://grupodin.com.br/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • http://grupodin.com.br/images/minecraft-free-download-windows-10_GM479516143.pdf
    • http://grupodin.com.br/images/send-me-500-2021-spins_GM406889139.pdf
    • http://grupodin.com.br/images/free-roblox-accounts-generator_GM431946152.pdf
    • http://grupodin.com.br/images/free-spins-coin-master-links_GM406889139.pdf
    • http://grupodin.com.br/images/is-minecraft-free_GM479516143.pdf
    • http://grupodin.com.br/images/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdf
    • http://grupodin.com.br/images/roblox-cheat-engine-health-hack-csgo_GM431946152.pdf
    • http://grupodin.com.br/images/how-to-get-hacks-in-island-life-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000518e.bin
65b5ec2b06bae6121a80603e9513e5c894d2f995181c6b4cc3e5afdd9fe788bb
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x518E 25216 bytes
font_01_sfnt_off00008c73.bin
fa25dd0ad6b4a100384a2ae69e34d5f55cf11f51b4d536b161bc4d4d540bffaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C73 19152 bytes