Malicious PDF — malware analysis report

Static analysis result for SHA-256 9877f4c4d419e13c…

MALICIOUS

PDF

35.0 KB Created: 2021-06-29 21:51:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 11bbb575f9aa4434df239925218975bb SHA-1: 49625813b213c28e48f184b189cb9e1d4aec4819 SHA-256: 9877f4c4d419e13c08e665feb817b9082876d8e770c9ab361891d0ed9e896cd4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a lure of free gift cards and game hacks to direct users to a link farm. This link farm contains numerous PDF documents, many with SEO-optimized titles related to game exploits and generators, suggesting a campaign to drive traffic to malicious or ad-filled sites. The ML classifier strongly indicated maliciousness, and the PDF structure points to a link farm strategy.

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.co/app/431946152/free-gift-card-gewnorater-for-robux-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info//repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-how-to-look-cool-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-codes-in-roblox-arsenal_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-free-pants-catalog_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/pokeon-ultra-brick-bronze-roblox-free-shiny_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/www-robux-com_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/earn-10-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/code-for-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-invisible-hack-download_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-cheat-in-leavels-booga-booga-roblox_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_off00003014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3014 22612 bytes
SHA-256: 39692c8679308f528227eb8bcb70b9d80ca0b22012243cf389615dfb31f094cc
font_01_sfnt_off00006301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6301 19280 bytes
SHA-256: ff163213af4a0d6aa3c3b7a574d9a1199f57dfb2143b85a810e5e59a37975a91

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