Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa72db774a8af28…

MALICIOUS

PDF

36.5 KB Created: 2021-05-17 18:44:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e8809e882e15f8d084e9bcc6daceff71 SHA-1: 309241de859293ccae84c4c662ba055e266a5ca6 SHA-256: 3aa72db774a8af285b33156c3089f4fa12063eacdce7227a74982e64384e9026
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple critical heuristic firings indicating it links to malicious redirector infrastructure, specifically promoting a 'Coin Master Hack' generator. The embedded URL and document body text reinforce this lure. While no scripts were extracted, the PDF's structure and embedded links strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

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/406889139/coin-master-hack-2021-no-human-verification-game-hack In PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_off000032f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32F3 24804 bytes
SHA-256: 86370ebf2117ed2320e5a44d29152d120f89fbc34b85c177cf1c7b7b207968a2
font_01_sfnt_off00006c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4C 18652 bytes
SHA-256: b8f105c40d85849bb980b8b1f3fc80cc73964bf3899fc8976168334accd52214

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