Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf03b5581ee31c4…

MALICIOUS

PDF

36.1 KB Created: 2021-07-04 03:49:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2637e75604b9ebcecb50f89c454c575d SHA-1: 65d0b9f52ed767c6f9dfa80d57059adda28d38c2 SHA-256: ddf03b5581ee31c403cc332e9569d805372a24720ef09d2915580fc5efbfbd5c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a high-confidence heuristic indicating it links to a 'free generator / game hack' redirector, specifically http://netcdn.tw/app/406889139/80-free-spins-coin-master-game-hack. This lure is designed to trick users into visiting a potentially malicious site. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest an attempt to deliver a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/80-free-spins-coin-master-game-hack PDF link annotation
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/hacked-roblox-t-shirt_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/how-to-get-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/roblox-working-strucid-aimbot-hack-2021-august_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/roblox-emergency-response-liberty-county-free_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-robux-codes-2021-may_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/redeem-roblox-codes-free_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/how-to-get-shelly-bag-in-roblox-booga-booga-free_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/roblox-game-pass-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/https-wwwrobloxcom-games-2021202196-freeubersummerrewards_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_off000035aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35AA 23132 bytes
SHA-256: 23e6c6db3334e4dde459e7c3ef3225227b9f6fe74855b8b008dcea34e968460f
font_01_sfnt_off00006999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6999 18556 bytes
SHA-256: 6aca12d1c5311c20ad8447472a8f74efe8546887157b26755d8bdae78e98e7b0

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