Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf2a17a4d3616c6…

MALICIOUS

PDF

34.4 KB Created: 2021-06-21 10:06:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 42ae23e417db455963eaf4909092dcab SHA-1: 05b82b4fe7adfedea6bf086fd92bd98e7804a514 SHA-256: 1cf2a17a4d3616c6ec0d3d1addbf6ee9b4767054b0f38dbb0f5d0c2b10d9993d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links and text that lure users with promises of game hacks, specifically for Roblox. The primary malicious URL identified is http://netcdn.co/app/431946152/how-to-hack-roblox-2021-game-hack, which is likely used to deliver a secondary payload or lead to a phishing site. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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/how-to-hack-roblox-2021-game-hack PDF link annotation
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/survivor-hacks-script-roblox_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/roblox-free-pants_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-roblox-account-with-domino-crown-2021_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/robuxian-hack-roblox-animations_GM431946152.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-robux-hack-no-human-verification-or-survey_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_off00002f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5E 22192 bytes
SHA-256: df82da124be9ab3944ef62d0765378eb22928876f5f8d6bcb350bcfcbb0c97a0
font_01_sfnt_off000060aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60AA 19224 bytes
SHA-256: 952aa56c448a3876108b271681fe1a59f9d49131b8b4cd095e69c290d9073af5

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