Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac90692888b8fb8a…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 04:08:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1a7f8a826a4a41480241721ca0fceb41 SHA-1: c800297865b468d74be3418063f55be9c6c44615 SHA-256: ac90692888b8fb8a3df4ccb4544be493be7cafe822abab179e2104f1c8871678
82 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with a high-confidence heuristic identifying a lure for a "free generator / game hack" related to Robux. The document body also contains similar links, suggesting the primary goal is to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the nature of the lure and the embedded URLs strongly indicate an attempt to trick users into downloading further malware or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/can-you-give-me-robux-game-hack PDF link annotation
    • http://htbrasil.net/ckfinder/userfiles/files/rbx-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/hacker-roblox-00_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/blox-rewards_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-hack-2021-december_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-hack-script-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-free-robux-hack-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/https-web-roblox-com-games-2021202187-free-join-now_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/robux-redeem_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-robux-hack-youtube-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-hax_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/cheat-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-hack-a-roblox-account-2021-easy-on-pc_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/all-roblox-2021-free-tails_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-hack-on-laptop_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/rbl-gg-free-robux_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
font_00_sfnt_off00002f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F79 21712 bytes
SHA-256: f7800225cfa82e7300a118ff916b6f9e3addd551a4cd64c4153da61cbe9d4f59
font_01_sfnt_off00005ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC3 19144 bytes
SHA-256: 1f6a9e9047b344f638cd05b3f78edeba13b5d629985c77c5a3334f114300de1b

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