Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b57fb81c2d7e8fc…

MALICIOUS

PDF

36.6 KB Created: 2021-05-20 16:30:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8a2bbb9a8b7dc8bafe5a715a3f009665 SHA-1: c4ae7e21185aeeb9a56c263a290fc454527ebee8 SHA-256: 0b57fb81c2d7e8fcef9b9b512cb91081a0a773897e8bae28ee047e9993c7fc9d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains embedded links and text promoting free in-game currency generators for popular games like Coin Master and Roblox. The presence of multiple suspicious URLs, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or scam attempt. The document body explicitly mentions 'Coin Master Free Spins App' and 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', indicating a lure to a potentially malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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-spins-app-game-hack In PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/roblox-rules_GM431946152.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/how-to-get-free-minecraft-coins_GM479516143.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_off00003489.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3489 25172 bytes
SHA-256: c3accb732200278cc80f70b61ec85872767865853340819e1708c78932c44425
font_01_sfnt_off00006ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE3 17884 bytes
SHA-256: 21af4872a04c62c178ac31651a333ecdcea5bb1ed4ceeeef1956d42e8fc37ea8

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