Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58efb5b3b3b66f8…

MALICIOUS

PDF

30.9 KB Created: 2021-07-19 09:54:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 99c23c7d40837dd8b01eeaf9512b3759 SHA-1: 1fb93a8e071d2c063e984cd12c36f3ab37ea775e SHA-256: c58efb5b3b3b66f888ce45ebbe0ce68c1559418338d4bee7325de84294423e19
82 Risk Score

Malware Insights

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

The PDF document uses a lure of 'Free Robux' and contains embedded URLs pointing to a redirector. The ML classifier and heuristics indicate malicious intent, likely to trick users into downloading a second-stage payload or visiting a scam page. No scripts were extracted, but the PDF structure and embedded links suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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-co-game-hack PDF link annotation
    • http://www.pbconsulting.it/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://www.pbconsulting.it/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.pbconsulting.it/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.pbconsulting.it/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.pbconsulting.it/images/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://www.pbconsulting.it/images/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pbconsulting.it/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://www.pbconsulting.it/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.pbconsulting.it/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pbconsulting.it/images/how-to-download-minecraft-for-free-on-iphone_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_off000025c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25C4 22132 bytes
SHA-256: 5b0cac348e29236dafb780e9cd94f16440d4447e3656bc17e0c3c6551a5753f1
font_01_sfnt_off000056ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56ED 18200 bytes
SHA-256: af0a6f01588019b38fd5688102a8ebe17e4b5155afa3360a762aee3dff872896

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