Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1494e34fd488eb…

MALICIOUS

PDF

35.3 KB Created: 2021-05-21 18:39:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: db237f296a43a12853d293718f7b8e79 SHA-1: 8c213f6321cbf6ac43923da22f1b16aa931de1f7 SHA-256: 7a1494e34fd488eb34800e890678fd161a2b797f0dc10f47de6efb9e0d709427
130 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector infrastructure, masquerading as a 'free Robux generator' or 'game hack'. The document body and heuristic firings indicate a lure to trick the user into clicking the link, likely to download a second-stage payload. The presence of embedded URLs and the nature of the lure strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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.xyz/app/431946152/apps-for-free-robux-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_off00002d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D20 26228 bytes
SHA-256: 9988ae4ab77407998e49e1127f30bf15755bde2f2dce4b942ee9045494ce4ca8
font_01_sfnt_off0000690e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x690E 18192 bytes
SHA-256: b6bed13222f637b3eaa93fd3412fcfb5f097d091c9d6b8306e759aa57a7fe68b

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