Malicious PDF — malware analysis report

Static analysis result for SHA-256 c388b34d993eb1eb…

MALICIOUS

PDF

40.8 KB Created: 2021-05-22 07:11:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e20d337e19ffada7539672a2adf2e265 SHA-1: 7314d1c0d2c9785a8d4b95c594bb9f8521b50a26 SHA-256: c388b34d993eb1eb3bea4cbd6d1e325c8c4edbfaeb9a4396a626f395802cfc13
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links and a call-to-action phrase, directing users to websites offering 'free Robux' or game hacks. These links, such as 'https://netcdn.xyz/app/431946152/free-robux-scams-game-hack', are indicative of a phishing or scam attempt designed to trick users into visiting potentially malicious sites. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

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-scams-game-hack PDF link annotation
    • http://iprep-u.com/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://iprep-u.com/images/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://iprep-u.com/images/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://iprep-u.com/images/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://iprep-u.com/images/hack-coin-master-apk-33_GM406889139.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_off000034f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34F2 32436 bytes
SHA-256: b111b8ed89fbd4c57727ea5183975d32126183800f2cb04f4e2e3dfe8997db70
font_01_sfnt_off00007de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE4 18500 bytes
SHA-256: f6eebadb3de4af7ab0205057cc55fc1daf9397692da1370c2a19d2d749ad11f1

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