Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa96b0a6e6b2b88…

MALICIOUS

PDF

42.0 KB Created: 2021-04-24 02:34:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 45f300ad53e94a8398d4109ec4143bed SHA-1: 75e073521ca1479f9e2fc9da7c563541321334c1 SHA-256: afa96b0a6e6b2b8838b51f0d1c72d1d9026b0e8a8fe75c716de246ea1384f1e6
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://netsecure.top/app/431946152/notoriety-roblox-loot-bag-cheat-game-hack PDF link annotation
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-robux-no-human-verification-no-surveys.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/getbux-me-free-robux.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-hack-roblox-players-acounts.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/get-free-robux-on-roblox-with-coputer.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-2021-roblox-accounts.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-hack-2021-ipad.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/robux-hacker-club.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-person-with-free-hoodie.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/earn-robux-for-freecom.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/hot-to-get-free-robux-2021-may.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_off00004375.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4375 27556 bytes
SHA-256: b420a5578b6cfb946acf90a00481ae8519db62b8eb51d35c699a6a7d962bc0ab
font_01_sfnt_off000080a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80A4 18872 bytes
SHA-256: fcb3250cbabf0cc7619d409782b49f17c28b78fbafea4b2b787c39f999eeea8c

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