Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d95c0ac2fd8f044…

MALICIOUS

PDF

39.9 KB Created: 2021-05-15 02:35:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b4ed3f6c4865644a76a9e502ccc74562 SHA-1: 110fb7883988a77906ac4f3d5bd13d3d51c3b16d SHA-256: 4d95c0ac2fd8f0440e3853f26e1ad47b2d28254dc829e5769559f4322e2547ac
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically advertising 'free Robux' and 'game hacks'. The document body and metadata confirm the use of wkhtmltopdf, and the heuristics indicate the primary purpose is to lure users to a malicious redirector. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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-safe-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003510.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3510 26024 bytes
SHA-256: fa13e82c6a7f8fb1a60bd9a27d7205b181a28c977383359247fca7e79992f350
font_01_sfnt_off000070d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70D7 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00007a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A89 18244 bytes
SHA-256: 393a0339ec2761f14ea9b29efa8c9c5fc9788b4979bd41a030a3ecef46023b5f

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