Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32efaec35162804…

MALICIOUS

PDF

39.9 KB Created: 2021-05-10 16:31:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7060129c9d9ca7ab4224506c0eb3881b SHA-1: be21d35e97c77d37a299d1d00769c33f96883a35 SHA-256: d32efaec35162804db6355d53aaf1d3901a4580f661acf1470973b4c3c8dce82
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to game hack generators and free spins, presented with a fake CAPTCHA lure to trick users into clicking. The primary link, https://netcdn.xyz/app/406889139/free-coin-master-spin-app-game-hack, is identified as a malicious redirector. The document's content and embedded links strongly suggest a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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
  • 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/406889139/free-coin-master-spin-app-game-hack In PDF document text
    • http://cristalysoptic.com/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/earn-roblox_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/roblox-redeem-robux_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
stream_003_off000042a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42A0 24704 bytes
SHA-256: b933740662618b2170a75867473d114a09dd93e0ca8f4bf8ee108523c55126c7
font_01_sfnt_off00007b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4F 17884 bytes
SHA-256: 6a5fc0e5ee3990f98fff047e5d02c1443490e61ce795861dff478bab25fb071a

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