Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecf6fc88c4e967e…

MALICIOUS

PDF

43.5 KB Created: 2021-05-17 21:40:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ff9171a7ceea9d756587fa24c9746a85 SHA-1: d00fc31567846c5dc1db608f05615b89d80faa49 SHA-256: 4ecf6fc88c4e967efa68070d86c6940cd277dd91411d4ef13b4521e81ea49ee0
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, masquerading as game hack generators. The document body, though heavily obfuscated, contains references to these lures. The primary attack pattern involves tricking the user into clicking these links, leading to potentially malicious content or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/play-coin-master-game-hack In PDF document text
    • http://londiniumcentre.com/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://londiniumcentre.com/images/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://londiniumcentre.com/images/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://londiniumcentre.com/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://londiniumcentre.com/images/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://londiniumcentre.com/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://londiniumcentre.com/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://londiniumcentre.com/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://londiniumcentre.com/images/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://londiniumcentre.com/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://londiniumcentre.com/images/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://londiniumcentre.com/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://londiniumcentre.com/images/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://londiniumcentre.com/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://londiniumcentre.com/images/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://londiniumcentre.com/images/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://londiniumcentre.com/images/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://londiniumcentre.com/images/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • http://londiniumcentre.com/images/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • http://londiniumcentre.com/images/how-to-get-more-spins-on-coin-master-for-free_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_off00004bf2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BF2 26480 bytes
SHA-256: b89139fd1f2adff31219b5fe5e4e7f0ed7ef1c67f34db9246c9cbd010fce5cf0
font_01_sfnt_off000088db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88DB 17956 bytes
SHA-256: 3643e479f0c37cbf16fafc1a8fc3121dcb1ff233e4f2886a877cfbec5145750a

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