Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be05ce8f4c096cc…

MALICIOUS

PDF

41.7 KB Created: 2021-05-17 04:45:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0cff6272246a275cfc215b30e185c329 SHA-1: bfeaa0874bb73f50833b1be304c55c7124676c13 SHA-256: 5be05ce8f4c096cc85aecc0ca1c98cc9ad85a0e823a8a0377d1240be50daab04
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a lure for 'free generator / game hack'. The document body also contains the malicious URL and a call-to-action phrase. The embedded URL is used to redirect the user to potentially malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/free-roblox-clothes-2021-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_003_off000032df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32DF 35488 bytes
SHA-256: 94dcfc5369af1f01824b54afd1c6fec017aafcce8fe2e787ee312cd2ee9999b9
font_01_sfnt_off00008115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8115 18620 bytes
SHA-256: 252330d33e31022fb4da09489f6402f078bd49276604afcef68628ac91e42d16

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