Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3a3e1ec8c5134a…

MALICIOUS

PDF

36.4 KB Created: 2021-05-14 16:41:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: da0dcea5d6d0e8eb1ed92ddcc98ba94d SHA-1: 53fdf5493b9522173a7099aca149aab50c366c5d SHA-256: 8d3a3e1ec8c5134ac38eb89b24dda3fd19406af2910aa1350bdf69c520559334
130 Risk Score

Malware Insights

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

The PDF file contains multiple links to a known malicious redirector infrastructure, specifically advertising a 'Coin Master Free Spin Link Today 2021' which is a common lure for phishing or malware distribution. The heuristic firings confirm the presence of malicious redirector links and a lure for a game hack. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest an attempt to trick the user into downloading a secondary payload, likely through a client-side exploit or a malicious script executed via the PDF viewer.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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/coin-master-free-spin-link-today-2021-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_off0000328d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328D 24672 bytes
SHA-256: ee938bfde98f2ba97afae7e3ddaf71eb27d92bce587d6e6d7dc1ea3ab4932b69
font_01_sfnt_off00006b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B50 18812 bytes
SHA-256: 209d45ed87732d827821998a5283e56b95c39a3af4032faff2e6da7d3e76f78f

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