Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20a8d921c17c124…

MALICIOUS

PDF

37.5 KB Created: 2021-05-22 07:36:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f4c9f11ad6c797e371e86175e046e488 SHA-1: 91f9dcd8ceeaa76db500aa60b6efb731c66d1fc6 SHA-256: f20a8d921c17c124aa2224eaff0513478d67eb1a3f8ac737dadd670fe0b8d399
142 Risk Score

Malware Insights

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

The PDF document contains multiple links and calls-to-action related to game hacks and free spins, impersonating brands like Microsoft. The ML classifier strongly flagged this PDF as malicious. The embedded URLs likely lead to credential phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/roblox-hacked-com-2021-game-hack.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/431946152/roblox-hacked-com-2021-game-hack PDF link annotation
    • http://45.115.65.99/__statics/gudangsoal/files/coin-master-free-spins-bit-ly_GM406889139.pdfPDF link annotation
    • http://45.115.65.99/__statics/gudangsoal/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://45.115.65.99/__statics/gudangsoal/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://45.115.65.99/__statics/gudangsoal/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://45.115.65.99/__statics/gudangsoal/files/coin-master-daily-free-spins-link_GM406889139.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_off00003231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3231 26568 bytes
SHA-256: f56bf45b5605212039ac8939ceb4f687043ea4becf3a9b73a533747040814e34
font_01_sfnt_off00006eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB1 19016 bytes
SHA-256: 1bdffeea421802d48c0c5f4972bc43262882194040db90b4400103ab0d186a68

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