Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9871f0d8ebb8f2b…

MALICIOUS

PDF

36.2 KB Created: 2021-05-16 02:02:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 334999dfe941e22e0899f25539783ca7 SHA-1: cdacbbaa88f2d19a8d809677c261139d3d413b3f SHA-256: d9871f0d8ebb8f2b1cf2ae42527381cd8051ecd92396dbfd6807c46f1ac11e84
130 Risk Score

Malware Insights

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

The PDF document contains a lure for a "Robux Free C" generator, which redirects to known malicious infrastructure. The embedded URL and the heuristic firings strongly suggest a phishing or scam attempt designed to trick users into visiting a malicious site. While no scripts were directly extracted, the nature of the lure and the redirector indicate an attempt to execute further malicious actions, likely involving a second-stage download or exploit.

Machine Learning

  • Nyx PDF Classifier clean score 0.0302

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-free-c-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_003_off0000336e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x336E 25020 bytes
SHA-256: b980d0e203d67fe151bbac0b7ac4a4850bd43beb66f8f55c4ef7ce9aa7dc9288
font_01_sfnt_off00006d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D29 18012 bytes
SHA-256: 3f1ded8a9c51e4f0f41c660fd84d3573ebe8f92a83837bcaa523a9614d650e73

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