Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c253a9c4652639…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 17:57:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ebd47dc40b45725d0ade2595577c81b0 SHA-1: 40ebf21b6487cb6f3a03470327fafd6fa0e1d953 SHA-256: f8c253a9c46526397f0a7d78165c727dd90f1e5aed056f008eb7da89de39a82b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, masquerading as free game hacks and generators. The primary malicious link identified is http://netcdn.tw/app/406889139/moon-static-coin-master-generator-hacks-free-game-hack. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic indicate a strong likelihood of the document attempting to redirect users to malicious sites, potentially for further exploitation or phishing.

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/406889139/moon-static-coin-master-generator-hacks-free-game-hack In PDF document text
    • http://perpus.masda.ac.id/repository/roblox-hack-shirt-id_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-gucci-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-credit-card-numbers-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/codes-for-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-o-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/real-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-hack-account-generator_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-bling-bling-card-coin-master_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_off000031c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C8 22808 bytes
SHA-256: 7433d9a6dc5ff921f9bc76559ba0bbb69599c3f026004ac9d5fdb1f5a609c22f
font_01_sfnt_off000064b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B5 18168 bytes
SHA-256: 480988a8bf3c5888bd5ebbfc15eb41d8e157e9bfee1c85e44027bf0723b89683

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