Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f658fbf8430fd75…

MALICIOUS

PDF

33.1 KB Created: 2021-07-19 07:21:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1f1532eaf4bb6cb8230b61b7dc9beb2a SHA-1: 11c3ef4b245918590cc338dcdf8ef7c50028d2aa SHA-256: 4f658fbf8430fd7575e9e7afa07aac8f3cca758d1f58cc4866c311a8d1e23cfe
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9900

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-working-game-hack PDF link annotation
    • http://dopheide.be/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://dopheide.be/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://dopheide.be/images/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://dopheide.be/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://dopheide.be/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://dopheide.be/images/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://dopheide.be/images/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://dopheide.be/images/free-tiktok-app_GM835599320.pdfIn PDF document text
    • http://dopheide.be/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://dopheide.be/images/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00002bcb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2BCB 22288 bytes
SHA-256: a41117cf8d1ad8a70f0efc7603a1e11daed33397db856a6f29dfbbfc4f1a5674
font_01_sfnt_off00005d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D35 18976 bytes
SHA-256: 8dcb95ab5b4d77256ac9226654650214032d861c3bd543aabb2d6fcb8cd11f02

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