Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d38d38ef84af73…

MALICIOUS

PDF

38.8 KB Created: 2021-05-15 13:18:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d8dc52a6819cbdef6a02309dff55f21d SHA-1: 7fb4ad8f0b668132ca0ae68f32dbe516b916f6b2 SHA-256: a9d38d38ef84af732c21613bf223fe78e6d775b80c8ab68ee4d959a6b51bf4c8
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body and embedded artifacts suggest a lure for a 'Krnl Download' which is likely a malicious tool or payload. The embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0127

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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00002eb8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EB8 28340 bytes
SHA-256: b37fff1a5ced023e23546a2f2d6bab28475a3f1527bae4370d4432bd8c992703
font_01_sfnt_off00006e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3D 2996 bytes
SHA-256: cacb31ed7ae08eb447514b3c9d1bd1b41f8e28b66da2297e18b47b11cddd699b
font_02_sfnt_off00007885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7885 17416 bytes
SHA-256: a1048d6611d162ff3a1642a4c64d878a7bbf30e58afdeeb0f731a625e376a451

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