Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ac3169383816e8…

MALICIOUS

PDF

45.2 KB Created: 2021-06-13 16:15:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1e9c740b57c5192d87a8fcbf90ff1f84 SHA-1: 2ef3038b77fbee62e36a37fbf8a1ec63b73f18b5 SHA-256: 35ac3169383816e80be364703ea99af469beb2190738ee971d404ae3a3c15ce3
122 Risk Score

Malware Insights

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

The PDF document contains multiple invisible links that lead to websites offering 'free Robux' or game hacks, disguised as CAPTCHA verification or download prompts. The ML classifier strongly indicates maliciousness, and the presence of these lures suggests an attempt to trick the user into visiting a malicious site, likely to download a second-stage payload or exploit a vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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/how-to-get-robux-from-roblox-for-free-game-hack
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/roblox-rape-hack_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/robux-free-promo-codes_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/coin-master-tool-hack_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-promo-codes-for-robux_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/coin-master-daily_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/pubg-uc-through-easypaisa_GM1330123889.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/robux-win-hack-free-robux_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-to-hack-in-roblox-without-recaptcha_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/rbxoffer-com-free-robux_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-robux-with-no-verification_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/master-free-spin_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/coin-master-spin-hack_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/minecraft-servers-that-allow-hacks_GM479516143.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-to-hack-coin-master-with-game-guardian_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/descargar-coin-master-hack_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-robux-legit_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/robux-apk_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-to-hack-robux_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/mcpe-optifine_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005426.bin
dd306f3e8f444211b34f1e3d3fbf5c33f0457ce99840e6e31988e8ce0dbe62ef		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5426 24836 bytes
font_01_sfnt_off00008d14.bin
576771a98eac59cbb3b29fcfbfe4cf1b1883671d3615b8151591a17f4ec77c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D14 18616 bytes

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