Malicious PDF — malware analysis report

Static analysis result for SHA-256 811b5234635f8dfe…

MALICIOUS

PDF

38.7 KB Created: 2021-05-23 14:12:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c5e910d2ee1a089981e77d5b5c73cbf2 SHA-1: c0b2527f6980ce643af95dfbc631a7d66b0115f2 SHA-256: 811b5234635f8dfe78ca99860b1f4656580e8b84e7284b1207e03380676562db
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 0.8060

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/free-spins-from-coin-master-game-hack PDF link annotation
    • http://bufbd.org/images/how-to-get-tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • http://bufbd.org/images/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/how-to-hack-coin-master-cheat-engine_GM406889139.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_off0000337e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x337E 24712 bytes
SHA-256: 9a1e73de5482881b8e3737266c1dcebb6c9ba3dc8b2983b49fe7871782389e3e
font_01_sfnt_off00006c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C12 2928 bytes
SHA-256: 64242521e32848fe2434190b0c7414fcd492221a3cc2972c66f57f4842775e11
font_02_sfnt_off0000762f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x762F 18148 bytes
SHA-256: a8179ab01d9f651dd6fb5ce3364ead5561884d8b40fe8a62eaf26fde05d0c646

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