Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfbe4f24124785d…

MALICIOUS

PDF

37.4 KB Created: 2021-05-14 03:08:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2c7241184e3442c6e9f8d9dd38323df7 SHA-1: 59444550024773f15b1192fb0307bcb810739fd1 SHA-256: 4cfbe4f24124785d134fc96431e43bd3e98ac2bc4c737ec9b2173899b363926a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body, though partially corrupted, contains references to the same URL and mentions 'wkhtmltopdf', suggesting it was generated by a tool rather than being a legitimate document. The presence of embedded URLs and the nature of the lure indicate an attempt to direct the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/how-to-hack-roblox-accounts-on-phone-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_off0000356d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x356D 25284 bytes
SHA-256: 2a975aadc9f3c7fd4196b0b011afef94b714b326cc1bc43dc6f662c95ab01a90
font_01_sfnt_off00006edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDD 18908 bytes
SHA-256: 92714a2af62378a1839a0ba08facac9787f9fdc52ffb1ff0f3d5734c2bdfa821

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