Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21cdc3260234674…

MALICIOUS

PDF

40.3 KB Created: 2021-05-17 09:24:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a81673eaf613eb0932dc509cfec99b86 SHA-1: 649771fe8745c0e2602263b039a0e9c5918ba807 SHA-256: e21cdc326023467471ec7b3eef28169bb6077d350963ca5282fa4fc59338e5ae
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure related to 'free game hack' and links to a known malicious redirector infrastructure. The document body, though partially corrupted, contains text suggesting a 'free generator' or 'game hack' and a call to action. The presence of embedded URLs and the heuristic firings strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0127

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/479516143/is-windows-10-minecraft-free-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000338d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x338D 28132 bytes
SHA-256: b6812e35c63519db0e53aeaa3356461990b4c82c4eb0384b06f01866f3135497
font_01_sfnt_off000071b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B2 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00007b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B52 18524 bytes
SHA-256: 171145d693b5cd868e8a770b6e84adad06c35cb86194a4ae2474cf18c95c1c24

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