Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f3215eb1f10033…

MALICIOUS

PDF

50.8 KB Created: 2021-06-09 09:00:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1c18b4d2c3e27cb406a6cc3aa8920e18 SHA-1: 5672c5a84d9a9d7630e560b66b02b274a00b2b44 SHA-256: a3f3215eb1f10033640f11afd097f40681465cb636d677d4f858065ac5d435db
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking a link, which is a common social engineering tactic. The document also contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to host malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/how-to-get-a-free-robux-in-roblox-game-hack
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/free-robux-by-watching-ads_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/free-script-executor-roblox-2021_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/minecraft-ps4-free_GM479516143.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/coin-master-support_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/coin-master-hack-tool-v1-9-pc_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/free-roblox-promo-codes-for-robux_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/how-to-get-free-skins-in-minecraft_GM479516143.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/robux-for-surveys_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/coin-master-free-spin-daily-link_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/roblox-free-robux_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/free-robux-gift-card-codes_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/free-roblox_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/free-coin-master-spin-and-coin-link_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/games-like-coin-master-for-free_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/how-to-hack-coin-master-spin_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/how-can-you-get-minecraft-for-free_GM479516143.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/robux-fun-hack_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/how-to-earn-free-pokeballs-in-pokemon-go_GM1094591345.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/coin-master-hack-version-download-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054c4.bin
54b87bde042dabe98a1e4d0129efd75773cc4429a161b147690b1e413bc1ccce		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54C4 28820 bytes
font_01_sfnt_off000096b6.bin
43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96B6 3992 bytes
font_02_sfnt_off0000a3dc.bin
b505fa84b879764d749773ced0da9571b9ad3eed878fa213a44222fd514d1092		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3DC 18356 bytes

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