Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18b81ac9f02cb3d…

MALICIOUS

PDF

42.1 KB Created: 2021-05-19 09:19:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7ded23a263b2c887f2405bde6bd66811 SHA-1: 79a7811e87b991bce8263bb0a42752f6f12055e2 SHA-256: b18b81ac9f02cb3d1137db7f85a2a9c6eae0b0e7b6d63e5572acd1627295e8c5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to external websites, including a known malicious redirector, disguised as game hack generators and free spin offers. The embedded URL 'https://netcdn.xyz/app/406889139/coin-master-free-spins-link-2021-haktuts-game-hack' is presented as a call-to-action, likely leading to further malicious content or downloads. The ML classifier also strongly flagged this PDF as malicious.

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-spins-link-2021-haktuts-game-hack In PDF document text
    • http://armportal.co.uk/images/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/pubg-uc-sale_GM1330123889.pdfIn PDF document text
    • http://armportal.co.uk/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/free-robux-working_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/robux-best_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://armportal.co.uk/images/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-hack-ios-no-verification_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_off000049f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F7 24200 bytes
SHA-256: 4752957e8ab2d13e1cddca7e79a2b44e7e3344052a04eecc32561f63e116e237
font_01_sfnt_off00008102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8102 18600 bytes
SHA-256: 17fca5a110173985813f3878a6a354acd9691d8bd8a3bfb3ba74e1722aeabc4d

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