Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbb94406f23bbe0…

MALICIOUS

PDF

41.5 KB Created: 2021-05-23 02:09:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8bf17391a88a0e8906fcc89e8d512151 SHA-1: ebee02750ad057a59dadea0d8df30c25202a8c18 SHA-256: dcbb94406f23bbe04735bf1aa5aee2d1844b6759dbb39aecd44504de399d9d38
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 0.7525

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-no-human-verification-or-survey-or-download-2021-game-hack PDF link annotation
    • https://hotelyetihome.com/userfiles/files/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/coin-and-spin_GM406889139.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/roblox-prison-life-hack_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_off00003449.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3449 26352 bytes
SHA-256: 13689b3b6b7446c603eaf2592d46c225b1392fa3351cf14f1a5b86267c375168
font_01_sfnt_off00007074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7074 3052 bytes
SHA-256: 2d76d9714e2ec94501ed467790610e23c45858056721987871e82718e2e89244
font_02_sfnt_off00007af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF8 20136 bytes
SHA-256: 66e5e50e12f5eb49621ab9bcd6ab85026409d616512a452c1eb3339dd9867554

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