Malicious PDF — malware analysis report

Static analysis result for SHA-256 b081ecee0dda331a…

MALICIOUS

PDF

35.5 KB Created: 2021-05-12 16:30:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bcf41d920159db1661d40ceca479e013 SHA-1: 4f0f2f142f09e6a47340d751e0fac3745e3c0fd3 SHA-256: b081ecee0dda331a7325ebde344f517e5cc973617fcdcfca22f49d55166faae2
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. It also displays a fake CAPTCHA, intended to trick users into interacting with the malicious link. The embedded URL is confirmed to lead to a redirector, likely for further malware delivery or phishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

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-free-account-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_off00003284.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3284 24892 bytes
SHA-256: 7fc1bb7b7b5a9d62af8712a1cc18c7df00fbc9abc66dd85cbde4e0a1e5dd6b10
font_01_sfnt_off00006aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAD 17848 bytes
SHA-256: 81db58af0d0a7c54bfcbf00b0a30aba5f5662412ae545e00ecca40055587a372

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