Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c8e7259d8748ba…

MALICIOUS

PDF

39.4 KB Created: 2021-05-20 13:02:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9e08fdd818c95247152f3811b43ee381 SHA-1: 769fb42dd808dd0482e352fbe988bbd8d2f383b6 SHA-256: 90c8e7259d8748ba707542af046bcb318759a8c60696ada2f0d09c19e8bfd3d8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains heuristics indicating it's a malicious document, specifically using a fake CAPTCHA lure to trick users into clicking external links. The document body and extracted URLs point towards websites offering game hacks and free views, which are common pretexts for malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of the malicious payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.xyz/app/835599320/how-to-get-free-views-on-tiktok-game-hack PDF link annotation
    • http://pustaka.lingkungan.ft.unand.ac.id/repository/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://pustaka.lingkungan.ft.unand.ac.id/repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.lingkungan.ft.unand.ac.id/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://pustaka.lingkungan.ft.unand.ac.id/repository/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://pustaka.lingkungan.ft.unand.ac.id/repository/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32E0 24776 bytes
SHA-256: 71eadbc2aabe2fd1e994e10fdd425078c4b9d55685c28c4414b60a09d25aaeb9
font_01_sfnt_off00006c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C52 4148 bytes
SHA-256: db7ec909c907b23088a98ecd4cd288b476f2f66785a6e3d81bc6469138abe306
font_02_sfnt_off00007a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A28 17752 bytes
SHA-256: d95dedae58cdb67c089f34f0d3d34b155600377962f13b80a86836881e651063

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