Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd2d928bfd0940e…

MALICIOUS

PDF

29.6 KB Created: 2021-07-21 08:12:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4dd0dccf7ca44b96dd07cc060be3dd0f SHA-1: 7c9c1f815549f1cd04434da6274da5e85f28cdc4 SHA-256: bcd2d928bfd0940ebb1a24722c398493bcbab3c98ec18205b2243c9d4ca69465
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a URL promising free TikTok likes and game hacks, a common lure for phishing or malware distribution. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the document body and heuristics indicate a social engineering attempt to drive users to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9252

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 http://netcdn.tw/app/835599320/how-to-get-free-likes-on-tiktok-game-hack PDF link annotation
    • http://gingerscience.co.in/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://gingerscience.co.in/images/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://gingerscience.co.in/images/minecraft-font-free_GM479516143.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
font_00_sfnt_off000023ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23EC 21836 bytes
SHA-256: 65bdd6ec51c283f4bc1de06136500714e422b1d9be62bf69a94cb6cef1135e25
font_01_sfnt_off00005420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5420 17620 bytes
SHA-256: 1c33fd3c5ea4f422d018a8404ca3ef9e1ac10e3d86ac92994d8eaeb97cd646a5

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