Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91169c5c4c996b0…

MALICIOUS

PDF

36.6 KB Created: 2021-05-25 10:13:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 821a1307ffb6f7d52fe4075b9f0c564e SHA-1: 1d9b8a003a49675875c7df712f1d919ea45c06d2 SHA-256: f91169c5c4c996b0d3acfd9ad3c4dc93645831b694898438bbb7d73ead362536
122 Risk Score

Malware Insights

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

The PDF document contains a lure for 'Free Robux Gift Card Codes' and embeds multiple links pointing to malicious domains. The heuristic firings indicate a redirector lure and a password-protected archive lure, suggesting the document is designed to trick users into downloading a malicious payload. While no scripts were directly extracted, the embedded links and lure suggest a multi-stage attack, likely involving exploitation and further execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/free-robux-gift-card-codes-2021-game-hack PDF link annotation
    • http://unifieo.br/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003086.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3086 26184 bytes
SHA-256: 02a8d9171eb6814e4d472cf2014a0895fd33fab0be088454a1493e241f5c46ad
font_01_sfnt_off00006b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2F 19044 bytes
SHA-256: a83203ba6d4d8e4db234da74518c811315008a13a6a61ff598d06d89853e7c2b

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