Malicious PDF — malware analysis report

Static analysis result for SHA-256 801a0de66f65f8b5…

MALICIOUS

PDF

36.3 KB Created: 2021-05-17 21:20:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 375db5f7d4121cbfc0ca195f2f1cdc95 SHA-1: 0a797841183ca5d3649bacecf364689e45f03342 SHA-256: 801a0de66f65f8b5aa21b5aae2c22bc56f3dad62593bcd3c01518afe443c39c9
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link disguised as a "Coin Master New Link Free Spin" generator, which is identified as a lure for a fake CAPTCHA or human verification prompt. This link directs to known malicious redirector infrastructure, indicating an attempt to lead the user to a malicious site. While no scripts were directly extracted, the PDF structure and heuristics suggest an exploit or a malicious link embedded within the document.

Machine Learning

  • Nyx PDF Classifier clean score 0.0303

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/coin-master-new-link-free-spin-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_off00003498.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3498 24640 bytes
SHA-256: ebe9c76d9f3ca28c3f8d78bfd12f39efb19457883b5691052e5ccd0908ef8fa1
font_01_sfnt_off00006c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8E 18220 bytes
SHA-256: fc744fe2e52d4688e6c6a84a10cbdbb55ee899ec83e64f0389d2a2ed44f6ae96