Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefa4575ee254681…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 11:20:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f77b4ef954d1420062a6e996f7e080b3 SHA-1: 1d3d8871569938eded29700eb842e37cf3ae6514 SHA-256: fefa4575ee25468190d84cc41d9644bd3ceaa0f10e362952b8a0e0545073168e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generator / game hack' lures. The primary redirector URL is http://netcdn.tw/app/431946152/games-that-give-free-robux-game-hack. This indicates a phishing or scam attempt designed to lead users to potentially malicious websites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a social engineering attack.

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/games-that-give-free-robux-game-hack In PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-key_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/dragon-ball-final-stand-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-r2d-money-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-hacked-accounts-list-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/tiktok-free-use_GM835599320.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-stuff-on-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-free-virtual-item_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-mobile-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_off00003284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3284 22444 bytes
SHA-256: 778c6ae7f67491b9846ba25184fa5cbd583deb24d6fb773f414885dec8a59ffa
font_01_sfnt_off00006418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6418 19480 bytes
SHA-256: a134365561edbdff80a1502dd404e307ea3328ecb7bf3d1da0fbfee9abe6ee6f

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