Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c5b6a6286f1bc4…

MALICIOUS

PDF

31.0 KB Created: 2021-07-19 08:02:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 86056e7d11a3f2deafe80e4f8719b637 SHA-1: dc6a46ee78bb1100f12433fae18ce3de65cbfb2c SHA-256: 47c5b6a6286f1bc432fd6a7dc116c31a14772682286bc46ead4e95d54f4aca09
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links and text promoting a "free Robux generator" and "game hack", directly linking to a suspicious URL. The ML classifier also flagged the PDF as malicious. The document's content and heuristics indicate a social engineering lure designed to redirect users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8800

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 http://netcdn.tw/app/431946152/free-robux-giveaway-game-hack PDF link annotation
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/hacker-minecraft-song_GM479516143.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
font_00_sfnt_off000023af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23AF 22328 bytes
SHA-256: 8f1adfb520a52a13bb9b5bf102142370b332e60581910daa58b43de2d0bf7021
font_01_sfnt_off0000555e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x555E 19004 bytes
SHA-256: 53c681b56d2aeec96b089841d9ffc48036577cfa01866e40d4f9479265023228

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