Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfba7c4fee3cf647…

MALICIOUS

PDF

36.2 KB Created: 2021-05-20 23:57:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ad24fb069493613482f511640fb1b93a SHA-1: c3ff071e10c7405535e2763503040065ba9d0fc1 SHA-256: dfba7c4fee3cf647b0ff327b96ba418a3857ebdad939c9492fd19a8c621923bc
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/479516143/is-minecraft-bedrock-free-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/cm-daily-spins_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/google-roblox-games_GM431946152.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_off000032b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32B4 24828 bytes
SHA-256: 66496390e93bd4b91028581f754e8fc07c20d61c2b24c2951188d6f430a677ce
font_01_sfnt_off00006c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C27 18268 bytes
SHA-256: afdb3a9705da5f9c049b4fffb2b7289241e4666a7f61338aed9abaf784133f07

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