Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5c7809dead2d19…

MALICIOUS

PDF

41.7 KB Created: 2021-06-02 12:03:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2881f697fc19b5b03680017c4e66f4e5 SHA-1: ef98353f9faf37bb2b2928aef01c688b23772866 SHA-256: 0d5c7809dead2d19e53054ff29308ce8732b435203d514a1bf5bf8bf444a17fa
82 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'free Robux' and 'game hacks', directing users to a suspicious URL. This URL is likely part of a social engineering attack to trick users into downloading malicious content or visiting a phishing page. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9697

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-link-inspect-game-hack PDF link annotation
    • http://kaleasm.org/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://kaleasm.org/images/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://kaleasm.org/images/i-want-free-robux_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_004_off0000403b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x403B 30240 bytes
SHA-256: bc611c4eca97d18f7f542ed9b038d94535561d0231cc5c1730c9a9b93e571829
font_01_sfnt_off00008082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8082 18584 bytes
SHA-256: ca010043b200a051f0e7ab07349adcc2731a525a2ba86b661f6cc6f8681ef9af

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