Malicious PDF — malware analysis report

Static analysis result for SHA-256 604e0dedc81f3d76…

MALICIOUS

PDF

38.7 KB Created: 2021-05-21 05:38:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6d4a6802b77c86864719e707ac9f6b1d SHA-1: 8630f4675bd60f7cfc1dd1f79c8e1b339143a378 SHA-256: 604e0dedc81f3d76c837e131afc3b3eedc129017f6223f352f3bd03c75fcac58
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as "game hacks" or "generators". The document body explicitly contains a call to action to "CLICK HERE TO ACCESS COIN MASTER GENERATOR" and links to various "free robux" sites, indicating a scam or phishing attempt. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-gold-cards-free-game-hack In PDF document text
    • https://www.efeskbb.com/upload/content/files/free-robux-site_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32AC 25744 bytes
SHA-256: 9d7bbb4cb60b6508a482f8bfee436a6c4d78e67f62f787b99d5227f813dcd69f
font_01_sfnt_off00006ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE0 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00007692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7692 17960 bytes
SHA-256: 5f0d383e38c54a4b706fba9e56337a6488be6196f7a5d6bfa1241f48271576e4

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