Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4112a16a3ef700…

MALICIOUS

PDF

44.1 KB Created: 2021-05-10 17:06:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4780d8de465ddaf3933b4b921d39cb0a SHA-1: 16818a3c0e4e12e7a95c680b2a5699573241128f SHA-256: bc4112a16a3ef7003ab7f547e338e94962a05624890beabeb0ae2da923c8ee2d
130 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically advertising a 'free generator' for a popular game. The document body explicitly contains phrases like 'Free Robux Generator Com Roblox Hack' and 'CLICK HERE TO ACCESS ROBLOX GENERATOR', indicating a social engineering lure. While no scripts were directly extracted, the heuristic firings strongly suggest the PDF is designed to exploit vulnerabilities or trick the user into navigating to a malicious site, likely to download further malware.

Machine Learning

  • Nyx PDF Classifier clean score 0.0142

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/free-robux-generator-com-roblox-hack-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_off00003529.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3529 29748 bytes
SHA-256: 772d77de98dd115f53e650184253da6e3305eccd7ed3677dd53ac44bfd721df7
font_01_sfnt_off00007932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7932 6700 bytes
SHA-256: ae114634718854704d615808d33fb1b747d90eb28e420080bd5adbdfe7fb6a27
font_02_sfnt_off0000896f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x896F 18852 bytes
SHA-256: 4f913a2277500713712aa6cd09c4e12b5f8093088fb24eab89a43b1b22929045

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