Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f32bb7fa8fd4d3…

MALICIOUS

PDF

34.5 KB Created: 2021-05-11 23:02:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: be1a26c0e79edd869ac98f68e98f8d17 SHA-1: 35c057dfe7be93c47280ffdc890759e51a34e060 SHA-256: 27f32bb7fa8fd4d33d8a2994d762c484e1eaa0db02948340f0d16b2ebe4a72cc
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 pointing to a lure for 'free Robux' or a 'game hack'. The embedded URL, https://netcdn.xyz/app/431946152/get-free-robux-game-hack, is identified as a malicious redirector. The document body also contains similar text and the malicious URL, reinforcing the phishing lure.

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/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_off00002a09.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A09 27012 bytes
SHA-256: 55c200721e81ddb415419aa0600f5f377a7d6314c13d830ff81946492e62752e
font_01_sfnt_off000068a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68A2 17348 bytes
SHA-256: 98d33a3e5dcdc7a6bc0b9114cd6e5535417b1839b4e1fdc9c72e26627771d0af