Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fd40350cdb7754…

MALICIOUS

PDF

34.1 KB Created: 2021-06-30 03:18:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6b8266e4846d146b84c9773c72468047 SHA-1: 9bdd7a59e908856584eeb1f32d6fe618fa7a7982 SHA-256: c7fd40350cdb77541a6377c1774072c145a319cc896bd4bad28e24f8a0567cbc
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and text explicitly referencing 'free Robux' and 'game hacks', indicating a lure for users interested in such topics. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' confirms this, and the ML classifier strongly flags the document as malicious. The primary attack pattern involves directing users to external sites, likely for phishing or malware distribution, which is consistent with a spearphishing attachment.

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-get-free-robux-2021-no-survey-game-hack PDF link annotation
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-free-no-login_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-account-hacke_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-intriga-injector-free_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-bee-simulator-cheats_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-hack-for-robux-kredi-kart_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/minecraft-wurst_GM479516143.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-roblox-builders-club-card_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-no-human-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/robux-earning-sites_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-vip-pass-free_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/what-is-the-best-free-game-executor-for-roblox_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/hack-vip-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_off00002f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F64 21380 bytes
SHA-256: 83edc1d3879b38bcdcede3bd633f0a8fb34592c67092675b97ce7740ea3ac544
font_01_sfnt_off00005dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEC 19680 bytes
SHA-256: bfcc669c8c008b22e9f868ff4814dd8ce281145be7b6545b4eeabe5f200816fe

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