Malicious PDF — malware analysis report

Static analysis result for SHA-256 155cf3ecb42bbfc0…

MALICIOUS

PDF

41.2 KB Created: 2021-06-02 06:36:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5e51cf2f5753857199aef6ecf693c69f SHA-1: e9402091338f7fbf0ca511a38bf6e578730fd021 SHA-256: 155cf3ecb42bbfc09001d92004ce72d84e2143b33e1ca2211e8d9c20a8c8349d
130 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising a 'free generator' or 'game hack' for Coin Master. This lure is intended to trick the user into clicking the link, likely leading to the download and execution of a secondary malicious payload. The document body and heuristics confirm the presence of these deceptive links.

Machine Learning

  • Nyx PDF Classifier clean score 0.0293

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/406889139/free-daily-spins-coin-master-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_004_off00003a30.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3A30 26320 bytes
SHA-256: dc6b23de971e8c5063caf5aff3c9972bcaa0f7a1de364f162fb3729f5fc6d7a3
font_01_sfnt_off0000757b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x757B 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00007f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2D 18308 bytes
SHA-256: 55eaac4e6bbee5e06de7435d22c867d27a3c8151a397b13177f5239675c95764

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