Malicious PDF — malware analysis report

Static analysis result for SHA-256 76209e3986e5a77d…

MALICIOUS

PDF

41.7 KB Created: 2021-04-27 23:51:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9faf46f85860e054db16d04b507e9235 SHA-1: cbbd581b1b86ad838040046df0f203ec92771aaa SHA-256: 76209e3986e5a77d10d0e69e9190f776d9a7a0328d3ec3c756871602dacf388d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure impersonating Facebook to trick users into clicking a link for 'free Robux'. The primary malicious URL identified is https://netcdn.xyz/app/431946152/instantrobux-com-free-robux-game-hack, which is hosted on a domain unrelated to Facebook. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely to facilitate credential phishing or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • 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/instantrobux-com-free-robux-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/instantrobux-com-free-robux-game-hack PDF link annotation
    • http://www.saburai.ac.id/elibrary//repository/teleport-roblox-hack.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-free-roblox-money-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/robux-hack-without-verification-or-survey.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-really-easy.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-free-stylish-animation.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/game-empire-tycoon-roblox-hack-script.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/does-getting-1-million-robux-for-free-work.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/claim-free-robux-roblox-rewards.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-generator-no-human-verification-2021-for-kids.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-hack-on-roblox-on-skywars.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_003_off000043b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x43B7 26844 bytes
SHA-256: 797a2752b0462a469b5dd1d0775f678480e0e78900c1972bbe7f10ba6d1d67a7
font_01_sfnt_off00008055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8055 18608 bytes
SHA-256: 8dc5e4a4d6d85719dc223a209bbd6c6384a4f372e2f959be1250e211c045044d

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