Malicious PDF — malware analysis report

Static analysis result for SHA-256 3661f5ca96993d30…

MALICIOUS

PDF

37.5 KB Created: 2021-05-11 09:12:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d0c05bf075085bcd87ac113cb7bd52c0 SHA-1: e5f5afe3525f7a92053abdf6cd6437ce6ed6571b SHA-256: 3661f5ca96993d30817d65d0bce29e91cdc3b8ae1236aa3eda0b4644d6b19750
130 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free generator / game hack'. The embedded URL, https://netcdn.xyz/app/431946152/robux-download-game-hack, is identified as malicious infrastructure. The document body also contains text related to 'Robux Download' and a call to action to access a Roblox generator, reinforcing the lure. The presence of a download button heuristic further supports the malicious intent.

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/robux-download-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_off0000349b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x349B 25584 bytes
SHA-256: 8249d2628654c8af7967c99d3eabd65b1f73f6cc48d14896646bbb9e76a1310d
font_01_sfnt_off00006fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE9 18656 bytes
SHA-256: 643f530bc401710360b2f74e2e590a7f6ab15445ebda3165faa7e078ea1fa698