Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcab4e44ca1a311…

MALICIOUS

PDF

37.6 KB Created: 2021-05-10 11:41:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c31f3341ec1b1624810c1b8dfbfba0a4 SHA-1: 278a3904134151184b9cc56aed144f5a4a27c978 SHA-256: 1fcab4e44ca1a311e4e01d511833ced85b548f35478d4f0a7c4cce2b0f69d5a7
130 Risk Score

Malware Insights

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

The PDF document contains multiple links pointing to known malicious redirector infrastructure, specifically advertising a 'free Robux generator' or 'game hack'. The document body and heuristics confirm the presence of these lures, indicating a phishing or scam attempt. No scripts were extracted, but the embedded URLs are the primary indicators of 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/free-robux-generator-no-verification-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_off00003612.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3612 25468 bytes
SHA-256: ce9d2c2e61cfc67ce98cf9f188cd958b759df55047f0d3e104a9617ddb451a51
font_01_sfnt_off000070da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 18600 bytes
SHA-256: fd611ad94f1c5362e5936d61a0ca6686a852f181e3b69dadbb107f1a26b259f7

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