Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d906cc41bd8d4e…

MALICIOUS

PDF

42.5 KB Created: 2021-05-13 22:02:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9295070a7bb634c47340f7c57d1aa4b6 SHA-1: 17d088e8ec9fdc3bbdb4a6a9ac53760ee0603279 SHA-256: b9d906cc41bd8d4e19f2116da169554fa676a62d311772633eafd71bd635ba7b
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to 'free Robux' for Roblox, directing users to a URL associated with malicious redirector infrastructure. The document body explicitly contains the text 'Games On Roblox That Give You Free Robux' and a call to action 'CLICK HERE TO ACCESS ROBLOX GENERATOR', which points to a phishing or scam attempt. The embedded URL is known to be part of malicious redirector chains.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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/games-on-roblox-that-give-you-free-robux-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_off00002fe0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FE0 28792 bytes
SHA-256: 6bc2458c718f569e0c30e65568d48e5f87e794e941d640bc901c88e433399b4d
font_01_sfnt_off000071de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71DE 6700 bytes
SHA-256: ae114634718854704d615808d33fb1b747d90eb28e420080bd5adbdfe7fb6a27
font_02_sfnt_off0000821b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x821B 19240 bytes
SHA-256: 3009583106c638257969d16940e6b1d2d6c9c8cef99a9d3856a451b20885bf07

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