Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff92209fb21b869…

MALICIOUS

PDF

42.3 KB Created: 2021-04-26 01:55:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8655b71ea1c7faed4a77bd8bff92266f SHA-1: bdf40d82c39ebfb4b9e00ad19d1057b0dd8ae483 SHA-256: 6ff92209fb21b869130b2f02ac254be8eb006bf42e2d704ac4d276e2f69ba2f1
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 game currency or hacks, impersonating Facebook and redirecting to a malicious URL. The ML classifier strongly indicated maliciousness, and the embedded URL is associated with credential phishing and game hack lures. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to a malicious site, likely for credential harvesting or malware delivery.

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.
  • 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/get-free-robux-points-game-hack.
  • 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/get-free-robux-points-game-hack PDF link annotation
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/robux-glitch-free.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-free-robux-in-roblox-no-hacks-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-use-cheat-engine-on-roblox-2021-august.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-look-girl-free.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-free-gift-card-codes-that-are-unused.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-admin-commands-roblox-download.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-make-roblox-not-detect-cheat-engine.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/hack-coins-pizzeria-roleplay-remastered-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/reversal-hack-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-becomming-rich-free.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_off000040c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40C1 29612 bytes
SHA-256: d08e98989b7557bb643bba22d817e755d55366a3aeab6fb2f6c85edb2ccb032f
font_01_sfnt_off0000835c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x835C 18392 bytes
SHA-256: 5a8e5be3a1e9fab6a5795533336b75e9fa4547c13549fa7bc99f0a936c227f8d

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