Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70c6669ffac0490…

MALICIOUS

PDF

35.4 KB Created: 2021-05-20 13:35:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 62cc166d8f2a0c49f119ead9e2176a53 SHA-1: 85f4d9e610c023fb57bf860c4069f993fa2ec734 SHA-256: b70c6669ffac0490efba7580189421feaa714d0217eea84d68a270bcd755a340
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically targeting users with a lure for free Robux or game hacks. The embedded URL, https://netcdn.xyz/app/431946152/sites-to-get-free-robux-game-hack, is identified as malicious. While no scripts were extracted, the document's structure and the nature of the embedded link strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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/431946152/sites-to-get-free-robux-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_002_off00002c0c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C0C 27776 bytes
SHA-256: e433b999924d0d3f7d5797ba3b0433709bcbc21d8bbbdbe45e9c1797b75e0246
font_01_sfnt_off00006958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6958 18236 bytes
SHA-256: b3c6e6b81f0aade665b3e9e34fb665158f9d1803db8458128eb468a961d6d74b

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