Malicious PDF — malware analysis report

Static analysis result for SHA-256 144559915ce3f624…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 04:25:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9ca3d49fbaa88077d1896c2034a635c1 SHA-1: 4444346e5313e11c8cf40092b245b1ccdd3baf03 SHA-256: 144559915ce3f624dcc0d9d793c86b76a61262e22fb2d8c087dad6fe90bfd41f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic indicating it links to a 'free generator / game hack' redirector, specifically http://netcdn.tw/app/406889139/fb-coin-master-game-hack. This lure is designed to trick users into visiting a potentially malicious website. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to a site that likely hosts further malicious content or exploits.

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/fb-coin-master-game-hack PDF link annotation
    • https://3qblocks.com.tw/image/data/files/how-to-earn-free-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/easy-robux-generator_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-hack-top_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/https-oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/mobile-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/pokemon-go-free-wallhack_GM1094591345.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-free-robux-hack-apk_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/minecraft-mod-updater_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-hack-into-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/get-free-robux-now_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
stream_002_off00003014.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3014 23096 bytes
SHA-256: bf160b73b3c4ac83c1a728143cc119439a903e43920ad5000624437e0ea535ef
font_01_sfnt_off00006418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6418 18156 bytes
SHA-256: 7a3cd79ff080fa27ccf3189e4d913bb82dfe371fff983502a27164cba1261ff5

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