Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bea9fca2df4d05…

MALICIOUS

PDF

35.9 KB Created: 2021-05-22 19:38:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e5f3175ed6a4f08bb862642d2136acdf SHA-1: d761ad9a37308e47cf93f41e6dfd58e3639991a5 SHA-256: 66bea9fca2df4d052b836493e7a4c20b20d09154539ec6215bc2a3913bf430c2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/406889139/coin-master-free-spins-link-today-game-hack PDF link annotation
    • http://nep-operationalmanual.com/images/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/free-robux-co_GM431946152.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.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_off000033bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33BD 24124 bytes
SHA-256: 3b4960a1a8d657ec2896f68f7c5d85cffe3de16434a62c67811665677de6448b
font_01_sfnt_off00006ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB3 18412 bytes
SHA-256: ee277532c3187caf3da016130e4cbd3fee848ac0b1174d0f40fc16c12ed3c41d

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