Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4aa4d52eb5f68f…

MALICIOUS

PDF

35.9 KB Created: 2021-07-09 16:46:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a4857c1cb65e3c377a6c76b3eeb25b4f SHA-1: 41bb037a01e55587b163cf1440d5f93861a49f52 SHA-256: 5b4aa4d52eb5f68f2812ec14aeab7f9842546a4cd6d241447f56e65721c78701
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 generators' and 'game hacks' for popular games. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-free-spin-and-coin-link-today-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow, likely intended to lead users to phishing or malware download sites.

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/coin-master-free-spin-and-coin-link-today-game-hack In PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-have-free-points-for-robux-in-oprewards_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-do-you-really-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/body-roblox_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-level-7-executor-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/robux-gratis-2021-pc-hack_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/new-free-money-links-coin-master_GM406889139.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/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/pig-master-free-spins-and-coins_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
stream_002_off000033d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33D7 23316 bytes
SHA-256: 4ad6983e55312e966130915c6a1d86663863fe1860300e1f04b5c1b8cc91b6f4
font_01_sfnt_off00006887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6887 18696 bytes
SHA-256: a6f9ee4f31e630697269259bd77ba9f20f050f36d84dfdb118abf4b75a264952

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