Malicious PDF — malware analysis report

Static analysis result for SHA-256 427e27cde29fd9c0…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 07:37:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b38770949c17793d0d95b53e172c6ffe SHA-1: 6b98ff2c8a00dd9cd4ac9083c95891a35655fbf7 SHA-256: 427e27cde29fd9c08000730acd7e07dd5f08c3ff9c3f15e0279d1d5ae8551043
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, presenting itself as a 'game hack' generator. It contains numerous links to external PDFs, many of which appear to be part of an SEO link farm. The primary malicious URL, http://netcdn.co/app/431946152/roblox-apk-hack-game-hack, is identified as a malicious redirector, likely leading users to further malicious content or downloads. The document body and heuristics indicate a clear intent to deceive users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/roblox-apk-hack-game-hack In PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-hack-unlimited-robux-robuxplus-live_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-eye-poppers-free-hack_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-codes-for-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/pokemon-go-free-or-shadow-mewtwo_GM1094591345.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/horizon-alpha-money-hack-may-2021-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/body-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/best-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-hack-boku-no-roblox-to-get-legendary-quirks_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-robux-images_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/atticus129-roblox-hacked-image_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/roblox-free-pants_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-roblox-cards-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-link-iphone_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_off000032ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32EC 22088 bytes
SHA-256: 2e3d6890b6ebdae1dbac3058641aa28b676a9cb574eb1def7aebfe915f9fc23f
font_01_sfnt_off00006403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6403 18832 bytes
SHA-256: 4a54e3c0999d22341ed87b7a4ab614cdfd6f3715e6a9eb51b324e9e7408846b1

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