Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bd3189e6dc71e7…

MALICIOUS

PDF

35.5 KB Created: 2021-05-22 16:23:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 71d87f180b45dfcaec021f8abe9da82f SHA-1: 99a4d329e1a3fda862e74930da3e7a6d83c37655 SHA-256: 81bd3189e6dc71e7f6d9380d77d24bcd61a26fa6ba83a18a0ba9da9bfe1c4eaa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains multiple links to known malicious redirectors, disguised as "free generator" or "game hack" lures. The document body explicitly mentions "Coin Master Free Coins" and includes a "CLICK HERE TO ACCESS COIN MASTER GENERATOR" call-to-action, further supporting the phishing pretext. The ML classifier also flagged this document as malicious. The primary attack pattern involves luring the user to click on a malicious link that likely leads to further exploitation or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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-coins-game-hack In PDF document text
    • http://cablelinkcoms.com.au/images/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://cablelinkcoms.com.au/images/tiktok-free-fans-video_GM835599320.pdfIn 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_002_off000033c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33C6 24292 bytes
SHA-256: 0de16f1128555f20c8930c6aa075df73f40e046beead43176f32654849c03758
font_01_sfnt_off00006afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFE 17712 bytes
SHA-256: 0afd6f2792edb83b7f2a0201a1e0a5eb12ca81ad868fb3e42742340ee6e5fb0e

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