Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07a4b35c1d93d15…

MALICIOUS

PDF

33.2 KB Created: 2021-07-19 06:20:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 628134e0c0c81f50c3a72c53f201c76f SHA-1: 662a50115d72c3e1cda7159ca38af75661d95cda SHA-256: f07a4b35c1d93d15edc03df88de83161726ab5caf9e5336faceb417ce01e4428
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' to entice users to click on a link. This link, http://netcdn.tw/app/431946152/free-robux-script-game-hack, redirects to a malicious site, likely to download a second-stage payload. The ML classifier also strongly indicated maliciousness, supporting the observed lure and redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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-script-game-hack PDF link annotation
    • https://www.fhccu.com/images/free-tiktok-views_GM835599320.pdfIn PDF document text
    • https://www.fhccu.com/images/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://www.fhccu.com/images/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://www.fhccu.com/images/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://www.fhccu.com/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/free-robux-app_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://www.fhccu.com/images/minecraft-com-free_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_off00002aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AA2 23020 bytes
SHA-256: a5607115dae946538b04195de7a622d4408e31679ff75ba6c3d7d2c6d1b6d755
font_01_sfnt_off00005ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA9 18600 bytes
SHA-256: 0da54a24aab33e035f815f2964bc14ed5ce25f178c33b60df2181b46b282b4f0

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