Malicious PDF — malware analysis report

Static analysis result for SHA-256 849df69a13ba070d…

MALICIOUS

PDF

27.1 KB Created: 2021-06-19 06:26:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a0e0c003c56437581d8bfb348cc85cbb SHA-1: b7ba62178f4eaef6bad00ac24d6195e91ccf8bdd SHA-256: 849df69a13ba070db8ad6c6ca1116028162781107da40be2f2ee0b316d07425e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for 'Free Robux' and a prominent call-to-action button, directing users to a suspicious URL. This URL is flagged as a malicious redirector, indicating a likely attempt to deliver a malicious payload or lead the user to a phishing site. No scripts were extracted, but the document's structure and embedded URL strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0329

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.co/app/431946152/free-robux-today-game-hack In 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_off00001501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501 22124 bytes
SHA-256: 006b9ff9cb436b395cf5c936641d43d8be2c35cd86cc7377e1801485c86c9624
font_01_sfnt_off00004622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4622 19072 bytes
SHA-256: 46cfca18e06d620ca18af6b576997b97068e9f2425fa6aacc62e6f72c392fa15

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