Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f3539b429ccfdb…

MALICIOUS

PDF

35.0 KB Created: 2021-05-25 09:35:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6b848cf59c064bd3fe14d03a55812027 SHA-1: d3ce06d431467cab38ce49dd4c6cf82dc1473655 SHA-256: 52f3539b429ccfdbc22b1e1d6b5681fcfae6b1de7cfa1f07d0e3a05cdf7575f4
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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 0.9648

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/479516143/free-minecraft-alt-generator-game-hack PDF link annotation
    • https://avn.kz/images/coin-master-daily-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • https://avn.kz/images/getrobux-now_GM431946152.pdfIn PDF document text
    • https://avn.kz/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://avn.kz/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://avn.kz/images/coin-master-15-free-spin-link-today_GM406889139.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_off00003238.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3238 24236 bytes
SHA-256: b2b762ee36ffdbbe6531f2973d6f83f7f7a806124e90c6a8e78b06441dcd4a06
font_01_sfnt_off0000692a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x692A 17784 bytes
SHA-256: 66ae3cfb6d310f144f42187aaa203441353bb0cc88c1a3915b2f7a14fa3c41b8

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