Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf58587e9a29548…

MALICIOUS

PDF

35.6 KB Created: 2021-05-22 23:37:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5d61a1039bfb7b68e120e959b0b857ed SHA-1: e0631dbb27145ecc0c944610fc4b032fa4ce1d13 SHA-256: 4bf58587e9a29548d6bd712ccb821c855f5374f3463b10f327c5a9cd7f275bd0
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a 'free generator / game hack' which redirects to a malicious URL. The document body and embedded links suggest a social engineering attempt to trick the user into visiting a potentially harmful site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/479516143/minecraft-skins-free-girl-game-hack PDF link annotation
    • http://korporacjaroma.pl/images/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/real-robux_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-robux-on-ipad_GM431946152.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_002_off000033de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33DE 24968 bytes
SHA-256: 7b1dbbfd0129f9ad013779c5a55336a009d30dea770fc85957975f0815d780e2
font_01_sfnt_off00006b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B90 17812 bytes
SHA-256: 7ce5d1bffc067a7697c6659b9f16d2693dfb8cdcb2edfb00fbdf7ce9282af41c

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