Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c222736cab9e93…

MALICIOUS

PDF

39.7 KB Created: 2021-05-17 15:30:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 96d374ee99470c3cde7134c828e2b67a SHA-1: d619b0bd9e26588aa51f639ec3a17518d62d7a17 SHA-256: b3c222736cab9e93a218a099bccbba87fdb01da811fcfdfec96a8e559c9d1652
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a game hack redirect lure, pointing to a malicious URL. This suggests the document's primary purpose is to trick users into visiting a potentially harmful website. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/robux-com-free-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000033e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33E8 25812 bytes
SHA-256: ddd41590713b7c03957458ec9664bc96a7a3ac181fe5da552128ef558bbed6dd
font_01_sfnt_off00006fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD3 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000079be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79BE 18276 bytes
SHA-256: 15a0db03ecad41b32ad15729058012b5ee1d917146ec7af3e780186d41394abc

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