Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7aa86e8205f0278…

MALICIOUS

PDF

35.8 KB Created: 2021-05-11 20:10:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8b737282a239a48c5f9bec8c4e3711d4 SHA-1: 77b120f1bdb2a92ff0a547bef844816c5f786f88 SHA-256: f7aa86e8205f0278859b61d5806df8053d0f811ee9f660a87dec3150472bccd0
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains embedded links that redirect to a known malicious infrastructure, specifically advertising a 'Coinmaster generator' or 'game hack'. The document also displays a fake CAPTCHA or human verification prompt to trick users into clicking the malicious link. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coinmasterfree-game-hack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/coinmasterfree-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_off00003165.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3165 25284 bytes
SHA-256: ed9de75a63d70087850f63759e8faa4daed8755da927e209d9869aa22eba7380
font_01_sfnt_off00006c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C36 17808 bytes
SHA-256: ed5fdd5441acd06a3bb02758ac945137dbfa7be696a0962169bf0eb95ec74bb8