Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fab4a5066c825a…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 13:06:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: eb33dd50626a8f6c733a92a43d155e7e SHA-1: 1fa8556dca3ab22a43c939e90d583504a6fca883 SHA-256: f7fab4a5066c825a21864e1ccc1f1d547affaddb62b5f47104bf8d4cb288b6c4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that lead to known malicious redirector infrastructure, specifically advertising game hacks and free in-game currency. The primary lure URL is http://netcdn.tw/app/431946152/roblox-script-hacks-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow, likely intended to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.tw/app/431946152/roblox-script-hacks-game-hack In PDF document text
    • http://lib.icbc-indonesia.org//repository/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/pubg-2021-uc-glitch_GM1330123889.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/rbxvault-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/hack-tool-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/hacks-for-roblox-trackid_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/is-free-robux-generator-safe_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-robux-mobile-root-needed_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-colouring-in-free-download_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_off00003066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3066 22772 bytes
SHA-256: be0dc8b658a410f0e671f024e484b48c0fbf6c17b92d8618b0562aa68df16b47
font_01_sfnt_off00006349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6349 19056 bytes
SHA-256: d579aac1d1158a15ad46381a3b3d03b5c9b37299ce5790291e99ad749e5be703

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