Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2831a52e3dc19b…

MALICIOUS

PDF

42.0 KB Created: 2021-05-12 15:30:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7b1571901dd76fe135a3c6a8ada1c08e SHA-1: 74a9983fc1c333d542e998b062476ac01d682a1f SHA-256: 4e2831a52e3dc19b563e7036d93e6e4f7087176e70a8d146f67892c0c2fcad79
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generator / game hack' lures. The document body, though partially corrupted, contains text related to 'Coin Master Free Coins 2021' and a URL that aligns with the heuristic findings. The presence of embedded links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-2021-game-hack In PDF document text
    • http://atrax.hr/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/robux-no-verification_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/wurst_GM479516143.pdfIn PDF document text
    • http://atrax.hr/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://atrax.hr/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://atrax.hr/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • http://atrax.hr/files/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://atrax.hr/files/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://atrax.hr/files/coin-master-ios-hack-download_GM406889139.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_003_off000048dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48DD 25116 bytes
SHA-256: acdc80a15dd6dc12045c1594d15c93d134cd2740bd0b72cf013c12e8c40c33c6
font_01_sfnt_off00008218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8218 18112 bytes
SHA-256: d3290bf375094f68ca2c73f068de3958d05aa7629a05aa779b6fc584462feea2

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