Malicious PDF — malware analysis report

Static analysis result for SHA-256 9171b9adb7b78ebc…

MALICIOUS

PDF

33.6 KB Created: 2021-06-19 06:37:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e6198a616321457c74f9767f167cf75f SHA-1: 1fd30bdbe5389dcd92b74699913d8aab678484eb SHA-256: 9171b9adb7b78ebc861311398791fb7e47556ba4daef8d0e8a8c462a84cc231d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free Robux, directing users to a malicious redirector. The embedded URL http://netcdn.co/app/431946152/free-robux-on-ipad-and-withoutb-downloading-anything-game-hack is identified as malicious infrastructure. The document body and heuristics indicate a social engineering attempt to trick users into visiting this link, likely leading to further malware or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.co/app/431946152/free-robux-on-ipad-and-withoutb-downloading-anything-game-hack In PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/robux-online_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-comcom_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-roblox-mad-city_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-deals_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-shield_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-villages_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_off00002aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AAA 21844 bytes
SHA-256: 469e982f531f28f26c0f883f48a99254b36f6251cd6ae8cd229b99b044c96d61
font_01_sfnt_off00005af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF4 20240 bytes
SHA-256: 51b4de6ee8b28ab96a7f9b141985fc73618069d2e854f85aa6dd59703c2e26bd

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