Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ba0889aee9c3cf…

MALICIOUS

PDF

42.9 KB Created: 2021-05-14 10:33:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b669391136e794ddb504a255c149fb75 SHA-1: d7223b1b03270c64290a6411a53e77a3a2a3143f SHA-256: b9ba0889aee9c3cf32b458a1bbe3ac25b43bdb1e52a6700153b2b68d554f0791
122 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a visual download button to trick the user into clicking a malicious link. The embedded URL, https://netcdn.xyz/app/431946152/roblox-games-to-play-for-free-game-hack, likely leads to the download of a second-stage payload. The ML classifier strongly flagged this PDF as malicious, supporting the observed social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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
  • 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/roblox-games-to-play-for-free-game-hack PDF link annotation
    • http://www.himalassociation.org/himal/ck_image/files/roblox-devil_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AEC 25312 bytes
SHA-256: f2690cdd7e982b0f08ca2f8d2563ad574e3affbf94a6f2f3a10176b66f2fbcf9
font_01_sfnt_off000083fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83FD 18768 bytes
SHA-256: ab23d1b79a91ba718332cf6cb35a2d4f002a60c6040c891a5ecca9d58b4dd5b1

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