Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86a8441b3757fe1…

MALICIOUS

PDF

35.3 KB Created: 2021-07-01 07:23:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 94075804eaf8a24b50761f546263d03b SHA-1: c4b23fc96c933dd1a323cfde133b574db4a1bef6 SHA-256: b86a8441b3757fe1ae5f6226f7cd8d8311b67dbe72bc64926aac79dfe34881dc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a document body that explicitly advertises 'Free Robux Games That Actually Work' and links to generators or hacks. The primary malicious URL, http://netcdn.co/app/431946152/free-robux-games-that-actually-work-game-hack, is directly linked to a PDF_GAME_HACK_REDIRECT_LURE heuristic. This indicates the document is designed to trick users into visiting a site that likely hosts further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-robux-games-that-actually-work-game-hack PDF link annotation
    • https://www.transvision.id/ckfinder/userfiles/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/free-robux-clothes_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/pubg-uc-hack-online_GM1330123889.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/free-tiktok-likes-and-fans_GM835599320.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/haktuts-free-spins_GM406889139.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.transvision.id/ckfinder/userfiles/files/minecraft-hack-client-download_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_off00002fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEE 22704 bytes
SHA-256: 3e9487888c362e86d5763f7cda144bc1a7cf01ccfc486839bffdb7f4fbefcd46
font_01_sfnt_off0000629b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629B 19868 bytes
SHA-256: d6d6c21ebfb94ec66429bf50c50e6ebacf9910fb21d66d19805e4ed0a6b06ac7

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