Malicious PDF — malware analysis report

Static analysis result for SHA-256 66275f7d1d002cf4…

MALICIOUS

PDF

42.5 KB Created: 2021-05-19 18:42:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bdcfc643534378eea9a2d65eb496b40a SHA-1: 59f45a2b726b743ce29ee84ff5653231099ef73d SHA-256: 66275f7d1d002cf442826a6432942198578b5d5538862680ef3869495c9401c4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the document contains multiple embedded URLs pointing to sites offering game-related cheats and rewards. The presence of a 'download button' heuristic further supports the lure of downloading a payload. While no scripts were directly extracted, the PDF structure and embedded URIs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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/431946152/robuxmatch-com-free-robux-game-hack In PDF document text
    • http://armportal.co.uk/images/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/get-robux-today_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/robux-get-com_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/demon-roblox_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/roblox-royale-high-diamond-hack_GM431946152.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/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ae9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE9 24296 bytes
SHA-256: d44088b84a6ae7fc721c55a8887277ee9086e9c2f4b5a713d1111334d72ed3df
font_01_sfnt_off0000829c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x829C 18772 bytes
SHA-256: ef8253bc9c644a400764ba46849deadc1c414499c30f017f83fef73bbdfbe327

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