Malicious PDF — malware analysis report

Static analysis result for SHA-256 635b06f2dd877d37…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 04:52:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 383e758d12c5f49f15ae26d804fbe4c4 SHA-1: ab04c54d800ac7ef6280e6bc13c37fa0abf47661 SHA-256: 635b06f2dd877d3725754d21e83e337c40af4bba24d64cde9cf83e5ff9c2b90f
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/coin-master-hack-download-game-hack PDF link annotation
    • http://librarysenior.com/repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-guess-that-song-rap-and-pop-cheat-sheet_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-coin_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-win-free-robux_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_off00003438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3438 22336 bytes
SHA-256: 4fef775e2104703bb6225244e4c9ad9932aee1820f7d66c1d0defdef45ed2583
font_01_sfnt_off000065c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C7 18584 bytes
SHA-256: 03b1cc7cfdedfcf80e81ee712db18b4eef764a898c1a4b3f4d0b4d202713d766

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