Malicious PDF — malware analysis report

Static analysis result for SHA-256 101761b526c9c11b…

MALICIOUS

PDF

36.6 KB Created: 2021-05-24 06:15:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a00e7391b55dae37f0701ed3ebc8936e SHA-1: 2f59adcbecdc8d8adf989f4e61973badfcd77950 SHA-256: 101761b526c9c11bcd283330949ee2fa2361b7d9eff0df8ea672dadd9d5a9e75
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 0.9447

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/how-to-get-free-robux-game-hack PDF link annotation
    • https://www.advancedcube.com/uploaded_files/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/free-robux-generator-no-verification-2021_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_off00003314.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3314 25368 bytes
SHA-256: 2e97e24e06e195af64a250427b3ca0aa1b87a5d1da0bfc80202a30b001e32c67
font_01_sfnt_off00006daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAF 18280 bytes
SHA-256: 2eeeedfcb2f224ab556fa0ab031baeab03f86dcbcf90e3baaaf5b6d88536dec3

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