Malicious PDF — malware analysis report

Static analysis result for SHA-256 9820569e12342f31…

MALICIOUS

PDF

30.6 KB Created: 2021-06-03 13:37:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2abd873fcb32f30942b156bbf29592ff SHA-1: a8c9481230080a3150c3aa959206974d897d5dde SHA-256: 9820569e12342f31a83041cd0c0d53eee4ea34df5fed059594437df1e75e7adb
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a malicious redirector disguised as a 'free Robux generator' or 'game hack'. The document body and heuristics indicate a lure to trick users into clicking the link, likely to download a second-stage payload. No scripts were extracted, but the presence of malicious links and the lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0486

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 https://netcdn.online/app/431946152/free-robux-2021-no-human-verification-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
stream_002_off00002008.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2008 23220 bytes
SHA-256: c7805c0dcf8f741d86734073c6aba702124c74b214136663f950d71773307307
font_01_sfnt_off00005414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5414 18956 bytes
SHA-256: 0bfab80fd88282460baaccc8001fb11442ff2f09b8f600836db734866bea2995

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