Malicious PDF — malware analysis report

Static analysis result for SHA-256 3431e85c155dc13b…

MALICIOUS

PDF

42.4 KB Created: 2021-04-25 13:20:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a5ac7e83de324a26d4a6dff95c6ae010 SHA-1: 1723c2d758ed2720f06ebc59f14af8aabd957d7b SHA-256: 3431e85c155dc13b26f647261b579cd2da3c4947a6969f19017cce81864d714d
82 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a game hack generator, which is a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the document body, though garbled, contains a URL matching the heuristic findings. No scripts were extracted from this sample.

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/how-to-hack-sword-fight-on-the-heights-on-roblox-game-hack PDF link annotation
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/como-hackear-robux-en-roblox-2021.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-code-inspect.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/robux-for-free-no-downloading-apps.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/auto-hockey-roblox-piano-hack.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/roblox-tix-hack-2021.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/roblox-jailbreak-money-hack-2021.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-2021-legit-working-100.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/roblox-claim-free-robux.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-android-no-human-verification.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-by-just-joining-game.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_off000042c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42C5 27552 bytes
SHA-256: c66e92328c1d593edcdf318067b46919d895559732476f594a0b5fa24e5df9ec
font_01_sfnt_off000080c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C1 19360 bytes
SHA-256: e2d9a82f55005b1711e88f2bc6d3121f5dea285017b9ba613b110221b89e3e25

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