Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d8e50b8668f5fc…

MALICIOUS

PDF

34.2 KB Created: 2021-05-20 20:14:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 227c615bad50c138d0cf1ce6989e92b0 SHA-1: 75547c60b66f684caae4ab5a5e4a5018a68adc8f SHA-256: 18d8e50b8668f5fce2a650d9af563bd82e923e7cc9c265459de83d2c41f34c8a
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 0.9508

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/835599320/free-tiktok-fans-app-game-hack PDF link annotation
    • https://stptonline.badungkab.go.id/assets/CKImages/files/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/coin-free-master_GM406889139.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/robux-hack-me_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_off00002f5c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F5C 23704 bytes
SHA-256: 0e7bc649fd97d6d47ad74788e546b7bae58eb7bd8eb7de53e82f4d55968a8486
font_01_sfnt_off00006560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6560 17860 bytes
SHA-256: 1e3492ee98958153d5b67204c6f76a863926e247abafa81850bcf2b3e46d8f1c

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