Malicious PDF — malware analysis report

Static analysis result for SHA-256 8903eda9c4fc5d3a…

MALICIOUS

PDF

38.9 KB Created: 2021-05-20 20:49:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 22aaabfc27872604ca8ec6b1787f6a41 SHA-1: eab38a96a9c0bdc6dd83d7dbc2317d21ec5c693a SHA-256: 8903eda9c4fc5d3a2e005f3374c07299cfed88b0f8118d5def723d691941ac2d
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 0.8060

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/how-can-i-get-free-spins-on-coin-master-game-hack PDF link annotation
    • http://empresa-venta.hr/files/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/play-minecraft-for-free_GM479516143.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_002_off00003400.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3400 23840 bytes
SHA-256: 682dd289e1454b0f1451c3ed12f9d32af8133b05a5152403a2ecaa22ae587bbe
font_01_sfnt_off00006a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A18 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000073ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73CA 19212 bytes
SHA-256: 99f99359b7141f70b8f4ce400c9fa5c3d8dbf589869db5ee26fa3d24c750b0d4

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