Malicious PDF — malware analysis report

Static analysis result for SHA-256 b148ed35fc8b3918…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 14:46:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5b999268b54b46fe6a3dcfb5d9770541 SHA-1: 243bc3dfe6c0de0f3e198dba294b68fa837fab98 SHA-256: b148ed35fc8b39185a1cb2979aa0c5f4f5c7861c4b5fd253074de6322841f3bf
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, including a primary lure to 'netcdn.tw' promising game hacks. It also hosts a large number of PDF links pointing to other game-related lures, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious, and the presence of external links suggests a redirection to potentially malicious content or further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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.tw/app/406889139/are-there-any-coin-master-hacks-that-actually-work-game-hack PDF link annotation
    • https://lib.bunghatta.ac.id/app/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-robux-codes-on-ipad_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-script-hack-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-team-death-match-map-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-people-hack-into-your-roblox-account_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/better-generator-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/slurp-download-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-hack-for-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-roblox-scibt-pack-exploit-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/can-i-build-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/money-hack-urbis-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/one-app-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/tips-and-hints-to-get-robux-for-free-hack_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/the-game-of-roblox-free-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-freebies-robux-hack_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-all-devices_GM431946152.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_off000030a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A6 22192 bytes
SHA-256: 4fec5903efd78718dcd1983a9a703c83ac74dc234cf56d2302eb8413c9d39a47
font_01_sfnt_off000061e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E7 18764 bytes
SHA-256: fda0f92cf4b877814e31b565e5e35f3727f0f59612dfc2e3edd29183971e4e11

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