Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33fa841bf2308a4…

MALICIOUS

PDF

38.0 KB Created: 2021-05-10 14:04:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 21b4330c162fbc256fe5581db6c10bda SHA-1: b9fc5275688241970e6dee4873b7bcd26740a5ea SHA-256: c33fa841bf2308a43237a5ade592193c252c1b4ab1642f0331e70abbe6180af4
160 Risk Score

Malware Insights

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

The PDF document uses a lure related to "Coin Master Hack" to entice users to click on embedded links. The primary link, https://netcdn.xyz/app/406889139/coin-master-hack-apk-free-download-game-hack, is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or redirect users to malicious sites, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9599

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-apk-free-download-game-hack In PDF document text
    • http://ferienwohnung-walker.de/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/coin-master-hacks-2021_GM406889139.pdfIn 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_off0000395e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x395E 24896 bytes
SHA-256: 55c4fc946a1aae1f6447273e2e7772931cedae13540e93c53810c82ada120742
font_01_sfnt_off000071da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71DA 18636 bytes
SHA-256: 9aef5eba1b944da03ad0d0211b0df86da0d90e0cf099764a6ba9c9a2ed29eb67

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