Malicious PDF — malware analysis report

Static analysis result for SHA-256 daff670ad4b17f41…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 05:57:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9e2f452802eecb6da0e37afec231bcda SHA-1: ab25d5cbad37091fc12806f6796b053b30d8025b SHA-256: daff670ad4b17f4177fb7f766aa8c66cd8e7dca04c2b9336691922b197c943bf
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors and lures users with a fake CAPTCHA, likely to trick them into downloading further malware. The primary malicious link identified is https://netcdn.online/app/406889139/coin-master-daily-spins-and-coins-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or trick users into executing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/406889139/coin-master-daily-spins-and-coins-game-hack In PDF document text
    • https://www.similar.com.tw/upload/files/wurst-minecraft_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/real-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-coin-master-account_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-tiktok-video_GM835599320.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-free-robux-without-downloading-apps_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_off00004eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EDA 24376 bytes
SHA-256: b18cb985e6a2e086f8af9e25f1f4fca3f3e217307457e2580fbbc076a76c342a
font_01_sfnt_off0000851c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x851C 18320 bytes
SHA-256: 72bd1e2907631a8d3a24a2cbbaf0d47ee6e4295bb5156def0c8a538e1f6b3f69

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