Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fc9d4739d22078…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 18:31:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d1eba82af7d529d2c49db2f73852e88e SHA-1: 86e52892338fb47c8c06e6ae1c7b48b19d95a24e SHA-256: e5fc9d4739d22078699787a1b08618ca87f7534e87c9cf710e44d142602ae8e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game hacks and currency to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn hosts further malicious PDF files. The ML classifier strongly indicates maliciousness, and the presence of multiple malicious redirector links supports 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/kachifpro-game-hack In PDF document text
    • http://cleansui.com.tw/image/data/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-hack-free-robux-no-downloading-2021_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-cbro-hack-2021_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/infinite-fly-hack-roblox_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/dominus-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/actual-free-robux_GM431946152.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_off00003338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3338 22544 bytes
SHA-256: d37697ce2d9a87817a6547f317d20f7aa015590199bfdc1a4489673c48e4d165
font_01_sfnt_off0000657d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657D 18072 bytes
SHA-256: 72a3da90a05afc5dc46f93167f9d09aeeb78081726754e710800ebd664932104

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