Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0ad5d06ac81a8c…

MALICIOUS

PDF

34.7 KB Created: 2021-07-07 13:20:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2e393aec82c972331ab05d6bf671e204 SHA-1: 17c99293505474684d31aa11fda5a8eec41edc82 SHA-256: ae0ad5d06ac81a8c2809db0a47acc354f76e1800c9a433d80c7751fdb3221f48
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The primary lure URL is http://netcdn.tw/app/431946152/free-robux-no-human-verification-or-survey-game-hack. This indicates a social engineering tactic to trick users into visiting potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt.

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/free-robux-no-human-verification-or-survey-game-hack In PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-free-followers-generator_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/hacks-de-roblox-para-todos-los-juegos_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-100-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-net-hack_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-admin-commands-on-roblox-without-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-tickets_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/como-usar-hacks-en-booga-booga-roblox_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-minecraft-skin-creator_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-free-stars_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-robux-with-cheat-engine-67_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-robux-hack_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_off00002e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E50 22732 bytes
SHA-256: 7bfc69f9ab3ac22861e9c0231a814984a185612035424086d0b9c08a90a9d321
font_01_sfnt_off00006107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6107 19628 bytes
SHA-256: cb05efb9b877c2f5ac358f74233e4765df12f9300101f4d7656cf4ee8e1f887a

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