Malicious PDF — malware analysis report

Static analysis result for SHA-256 480d21a0a02ea661…

MALICIOUS

PDF

36.2 KB Created: 2021-07-09 06:23:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 480649aaa0b6bab1bb63dc0747aab5af SHA-1: aaf71d42ad8fa411bbef809ebb235a85cf96f08f SHA-256: 480d21a0a02ea6616b079c0a576e077d5874fb6cde1a27226605b75b673a2a1f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free Robux'. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-homepage-game-hack. This indicates a social engineering attack aimed at tricking users into visiting potentially harmful sites. No scripts were extracted, but the presence of multiple malicious links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-homepage-game-hack In PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-block-piece-hack_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-sword-fight-on-the-heights-original-how-to-hack_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-robux-hack-2021-generator_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/get-roblox-items-free-chrome-addon_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-robux-videos-recent_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-skin-free_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/legit-free-spins-coin-master_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
font_00_sfnt_off000033ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33EF 24216 bytes
SHA-256: a2eb2d70f6baf3a10a0c87c07baf783e5b38f74ad8bce2f3d39e06cda1d7ce62
font_01_sfnt_off00006afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFB 18272 bytes
SHA-256: 4f50b080c0e0e9872089a20b246d15d020aeff6e057a645923069bcd0b94099b