Malicious PDF — malware analysis report

Static analysis result for SHA-256 d440d1dc5a06c4d5…

MALICIOUS

PDF

34.1 KB Created: 2021-07-09 02:00:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e7b6ea371d442979c2656befbd9ef5a6 SHA-1: 58fd887bcfbb7b351ad91556cead2816da43a296 SHA-256: d440d1dc5a06c4d55ef319e55a770e7dfeeb7a1906eba5b7df1c2dcdf581bbb6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-risk heuristic firing for a game hack lure, directing users to a suspicious URL. The document body also contains the same URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of a malicious payload being delivered via the link.

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/431946152/earn-free-robux-game-hack PDF link annotation
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-dominos-code-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/robux-giver_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/robux-match_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-with-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/supreme-roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-btools-hack-2021-unpatchable-working_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-use-cheat-engine-on-roblox-without-getting-kicked_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-2021-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-do-i-get-free-robux_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_off00002f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4D 22432 bytes
SHA-256: 1b044b616937121ec8c6a5e8ed8c90eb4725a9676c340e4231500a9075c6207b
font_01_sfnt_off00006120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6120 18716 bytes
SHA-256: 8f38c6e249cfb46641478d2db6e31ecd999c597cf7db8b591ffee8c5f62f2864

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