Malicious PDF — malware analysis report

Static analysis result for SHA-256 93553c95f9c19ad5…

MALICIOUS

PDF

47.6 KB Created: 2021-05-14 23:32:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c699a54a7578596fe0f861cd8a7b1ba1 SHA-1: 1ab337b57ce0e9bac3fccd54f1ea66da4268f136 SHA-256: 93553c95f9c19ad5540231a09aaccbac6b59e73957ec5fc9c1852ff70c1689cf
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, primarily to external PDF files hosted on 'dolphintour.vn', and a redirector URL on 'netcdn.xyz'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass link farm, suggesting a tactic to drive traffic or distribute further malicious content. The 'PDF_GAME_HACK_REDIRECT_LURE' heuristic confirms the lure is related to game hacks, aiming to trick users into clicking these links. No scripts were extracted, but the sheer volume of links and the nature of the lures point to a content-driven malicious distribution or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://netcdn.xyz/app/431946152/roblox-hack-app-game-hack PDF link annotation
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-hack-apk-android-1_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_off00004a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A8D 35268 bytes
SHA-256: 163eb81967737028d7aa4e7cfa4162eac73f1061a136627e244a6d0091352da4
font_01_sfnt_off000097f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97F1 18356 bytes
SHA-256: 7cdc4109e76722f5b523df4cd1b295e2212ddbe91aca110ba626f8c95e058f26

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