Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a5bf4210deaee9…

MALICIOUS

PDF

45.2 KB Created: 2021-05-15 12:30:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 26a9751520432ba7bfc09039f776f2e0 SHA-1: 7451ea3280c7427a2b52423decaf4de7b3986a9b SHA-256: 22a5bf4210deaee92408c4996b0c9f9f7fc820f89b495923c84e8741f40e5f44
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/431946152/hacks-to-get-free-robux-game-hack PDF link annotation
    • http://cleansui.com.tw/image/data/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-robux-net_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-spins-link-may-2021_GM406889139.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/hack-coin-master-spin_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/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/25-free-spins-coin-master_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
font_00_sfnt_off00004948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4948 24096 bytes
SHA-256: 9dc1bb19b6dce0548f7ecdd9d6bc72ad3634739a38ab5ac763eb9f97e24cb0cf
font_01_sfnt_off00008064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8064 3924 bytes
SHA-256: b746ba3a57b90e08879572bbe7881df15a71c38b09470fbbade98a25a8f1731d
font_02_sfnt_off00008d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D38 18516 bytes
SHA-256: 49067203d4eb86d04ddf999d64ba4750afe8b15cea6fed862c5ee30987f881c1

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