Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20d083c19b191af…

MALICIOUS

PDF

34.6 KB Created: 2021-06-27 22:48:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 88869efa594ddecbebdebeac1814a41d SHA-1: 6c15feed4d2d6d325ba0d99fb4f3f39e121686ea SHA-256: f20d083c19b191afa15a2236c6c7408e9dec67590892394addcb8598af3fbad6
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.co/app/431946152/roblox-774-hack-game-hack, which leads to further malicious PDF files. This indicates a phishing or scam campaign designed to lure users to malicious sites.

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.co/app/431946152/roblox-774-hack-game-hack In PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/natural-disaster-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-hacks-for-roblox-counter-blox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/wall-hack-cs-go-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-money-in-roblox-high-school-cheat-engine_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_off00003123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3123 22232 bytes
SHA-256: 1c29b9b4ba5d3bbd0954933ebbe0319a20d14078b967900724a2515abe4104b6
font_01_sfnt_off000062c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C2 18776 bytes
SHA-256: 1353fe08fa8b6aef6a46f59bbe5cd9d222f34a1cc12e2ef68719ef584c26dd5c

Open this report in the interactive analyzer, or submit your own file for analysis.