Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcb9d4fb5bf379b…

MALICIOUS

PDF

42.6 KB Created: 2021-04-30 12:50:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fba99f1844839fb9641e9ecf5c46de85 SHA-1: 11dca5a96bfe848acf75e6fd625bfa4dc73a004c SHA-256: 7fcb9d4fb5bf379b1ee7b72ef0e52f4b08b203ba423bc2368d5a500ae8020fda
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'Free Robux' and directs users to a suspicious URL, indicating a phishing or scam attempt. The embedded link and document body text strongly suggest a social engineering tactic to trick users into visiting a potentially malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic firings point to a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • 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.
  • 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-cash-out-game-hack PDF link annotation
    • http://repository.poliven.ac.id/repository/roblox-hack-bars-2021-for-pc.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/como-instalar-hackear-para-roblox-robux-2021.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/robloxclick-hack.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/roblox-thinknoodles-free-fall.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/roblox-hack-me-robux.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/free-robux-download-tool.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/free-bandit-mask-roblox.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/free-account-roblox-real.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/how-to-hack-someones-roblox-account-with-cheat-engine.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/robux-generator-hack-2021-no-survey-november.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_off00004152.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4152 29476 bytes
SHA-256: 445e92e2f137aed1f70aa3a6e202acec83d59b8c72ae22c740b810bd4a0720cc
font_01_sfnt_off00008416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8416 18512 bytes
SHA-256: 4dd97cbb4778bcec44e52ef253067d1d52768737169970f899de8a2cb0d2a707

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