Malicious PDF — malware analysis report

Static analysis result for SHA-256 298ba20b5e51248f…

MALICIOUS

PDF

42.6 KB Created: 2021-05-13 02:39:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ca49423ab896d19cd248a9e1ef212375 SHA-1: dac1d536826d72cc96309827215a9809b1130d1d SHA-256: 298ba20b5e51248f2e75931e42c876f733a359477f9648c5987fb7ee3c41c93a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to obtaining free Robux, directing users to a suspicious URL. The presence of a visual download button and instructions for handling password-protected archives suggests a multi-stage attack designed to bypass security controls. While no scripts were explicitly extracted, the ML classifier and URI findings strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.xyz/app/431946152/how-to-get-free-robux-without-email-game-hack
    • https://www.drsertac.net/upload/content/files/free-coin-master-s_GM406889139.pdf
    • https://www.drsertac.net/upload/content/files/how-to-earn-robux-by-playing-games_GM431946152.pdf
    • https://www.drsertac.net/upload/content/files/free-robux-no-verification-no-download_GM431946152.pdf
    • https://www.drsertac.net/upload/content/files/coin-master-free-spins-2021-no-human-verification_GM406889139.pdf
    • https://www.drsertac.net/upload/content/files/free-robux-now_GM431946152.pdf
    • https://www.drsertac.net/upload/content/files/hacks-and-cheats-for-coin-master_GM406889139.pdf
    • https://www.drsertac.net/upload/content/files/free-robux-images_GM431946152.pdf
    • https://www.drsertac.net/upload/content/files/coin-master-free-spins-link-2021-download_GM406889139.pdf
    • https://www.drsertac.net/upload/content/files/how-to-get-free-robux-on-pc_GM431946152.pdf
    • https://www.drsertac.net/upload/content/files/when-was-minecraft-free_GM479516143.pdf
    • https://www.drsertac.net/upload/content/files/hack-the-coin-master_GM406889139.pdf
    • https://www.drsertac.net/upload/content/files/how-to-get-free-robux-for-real_GM431946152.pdf
    • https://www.drsertac.net/upload/content/files/free-roblox-clothes-2021_GM431946152.pdf
    • https://www.drsertac.net/upload/content/files/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • https://www.drsertac.net/upload/content/files/how-can-i-get-free-robux_GM431946152.pdf
    • https://www.drsertac.net/upload/content/files/coin-master-hack-fast_GM406889139.pdf
    • https://www.drsertac.net/upload/content/files/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdf
    • https://www.drsertac.net/upload/content/files/oprewards-free-robux_GM431946152.pdf
    • https://www.drsertac.net/upload/content/files/free-robux-com-real_GM431946152.pdf
    • https://www.drsertac.net/upload/content/files/cmaster-club-coin-master-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047c9.bin
9e3174a2b6142dddf191c4ab7b209e310b4efd4b587388a63e5a1f706d7795f3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C9 24900 bytes
font_01_sfnt_off00008129.bin
2bb545c14ce80967bc964a539ce1fba7d75b9199f0e299556cda79647f99e488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8129 19328 bytes

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