Malicious PDF — malware analysis report

Static analysis result for SHA-256 257d150aff85a8fc…

MALICIOUS

PDF

45.2 KB Created: 2021-05-14 00:27:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a063606e8a1594b9878a26c3fc1fa570 SHA-1: d12fb2e0e050b413aaa91dc6af71846d85ef8e50 SHA-256: 257d150aff85a8fce5d0a5da4ce43b29ff580fdfed059d44a6321350e16a447a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains multiple links and a visual lure to a 'game hack' website, indicating a social engineering attempt to trick users into downloading potentially malicious software. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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 https://netcdn.xyz/app/406889139/download-coin-master-hack-game-hack PDF link annotation
    • http://cleansui.com.tw/image/data/files/coin-master-attack-hack_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/vip-roblox-free_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-free-pets_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/gold-cards-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/game-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/robux-in_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004abc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ABC 24776 bytes
SHA-256: a36a3cc04f9ffe68e850e85ec26ce1f0a0eda3c46a77311328b9e11115619e01
font_01_sfnt_off000083e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E8 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD3 18296 bytes
SHA-256: 539984bea6ae54f87077e5f6931fd11dcc96f9ae0706aaad6012300b174a755d

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