Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5269950bb2d307f…

MALICIOUS

PDF

34.6 KB Created: 2021-06-27 15:21:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 55572babcfaf5136b1fc1a658c052af7 SHA-1: 7a594bef58ea403c4504a7ec5003deab9d8b8dd2 SHA-256: c5269950bb2d307f436fd0ff147c45704ecca0cb748a6458bbe28e4d7542dc95
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering game-related cheats and currency, such as 'free robux' and 'free spins'. The primary link, http://netcdn.co/app/431946152/free-printable-roblox-banner-game-hack, is identified as a redirector to potentially malicious content. The presence of these lures and the ML classifier's high confidence score indicate a phishing or scam attempt.

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.co/app/431946152/free-printable-roblox-banner-game-hack PDF link annotation
    • http://gornjastubica.hr/files/free-robux-really-works-no-surveys_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-come_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-reward-link-2021_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-use-racist-dolphin-on-free-exploiter-roblox_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/robux-without-verification_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-do-i-get-free-robux-on-roblox_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_off00003217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3217 21904 bytes
SHA-256: 044e9390e38da870779d6f9753acec492768a605f2b3bccfc7aa13ba4b437a02
font_01_sfnt_off00006287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6287 19028 bytes
SHA-256: 150a666c951586e8002989ff587d824b0f914f379b9c15a6dfafd2bcd970b82e

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