Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e13dfb405e47314…

MALICIOUS

PDF

35.3 KB Created: 2021-06-26 12:10:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 40b41555593044fc965f06e5446b5f83 SHA-1: 0320aab48353c79fb8b3e05e309b97f436a3f169 SHA-256: 4e13dfb405e473147ea819fae4312f3395afdbc3e9471eb616ac0d9bf5468695
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The document presents a fake CAPTCHA or human verification prompt to trick users into clicking malicious links. The embedded URLs lead to pages offering free Robux or game hacks, which are common lures for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://netcdn.co/app/431946152/box-land-free-robux-game-hack
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-coins-coin-master-2021_GM406889139.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-star-codes-roblox_GM431946152.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/earn-free-robux-on-roblox_GM431946152.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-roblox-accounts-dantdm_GM431946152.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/best-free-hacked-client_GM479516143.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/roblox-free-download-for-chromebook_GM431946152.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-robux-no-downloading-apps_GM431946152.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/minecraft-education-edition-free-download_GM479516143.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-hack-no-verification-2021_GM406889139.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-levels_GM406889139.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-roblox-hack-us_GM431946152.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/download-minecraft-bedrock_GM479516143.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-online-hack_GM406889139.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-34-4-hack-download_GM406889139.pdf
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003350.bin
189495b3faa7207c95fd62637ef41e6a22369f9115cdac926605d37be8b3d859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3350 22524 bytes
font_01_sfnt_off00006590.bin
a59e2e41d5ca66de5fa513a3ea8057a141324f8d9fea4f02994f2926ca7c2495		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6590 18888 bytes

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