Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b0efac6609685d…

MALICIOUS

PDF

36.5 KB Created: 2021-05-22 19:52:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fe41c2c439ea7ed2e72747926cf6c078 SHA-1: c47ce9e5455e32dace222a6f5f2e7f5345c77338 SHA-256: 21b0efac6609685da06a89a439d551567b1599486048f78c2f0c184cf08e8275
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "free Robux" and "game hacks" to entice users. The document body and heuristics indicate a lure designed to trick users into clicking these links, which likely lead to further malicious content or malware downloads. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/get-free-robux-game-hack In PDF document text
    • http://wirelesscommsys.com/images/robux-free-com_GM431946152.pdfIn PDF document text
    • http://wirelesscommsys.com/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://wirelesscommsys.com/images/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://wirelesscommsys.com/images/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://wirelesscommsys.com/images/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000336c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x336C 25596 bytes
SHA-256: b0523c99312251bb9961661a642d28e20ace8ae8d37a3ec6babbe96844739905
font_01_sfnt_off00006de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE3 18120 bytes
SHA-256: 79ac164380d838bf2943c127f808202d45f8751c05dbd036140e6fb9b1b49848

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