Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd52071b702c4a1c…

MALICIOUS

PDF

37.7 KB Created: 2021-05-19 12:32:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a148d233107d18c41d4ab10578c07d9f SHA-1: ea4b693b72c9d9befaa5d59c9967dcb9bc931ccf SHA-256: bd52071b702c4a1c9c254241073eebc7ddee4456fbd26f77f80b58ad781f8263
130 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to a lure for a 'free Robux generator'. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-generator-for-roblox-2021-game-hack, is identified as malicious infrastructure. The document body also contains text and links related to this lure, reinforcing the social engineering aspect. While no scripts were explicitly extracted, the nature of the PDF and the redirector suggests an attempt to exploit vulnerabilities or trick the user into executing further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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-for-roblox-2021-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
font_00_sfnt_off0000352f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x352F 26308 bytes
SHA-256: b4c9dbacc7aa917be2dd16205ff56e4952de315978c91c7e137db1d93fe33271
font_01_sfnt_off0000707b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x707B 18820 bytes
SHA-256: ebe9c90542e8fe2fea15c90130dc88571bff9717049b6ef0e566bae53a322baf

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