Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4092e1eb66726c…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 13:11:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d76e11a9e8ab50570f1f2b8276e18964 SHA-1: 22aa34de1248d10a5e43b463bbf4528153d6e32d SHA-256: cd4092e1eb66726c320ae59fe50a6c39c291e44dd435af804acb108bca8556c2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, specifically advertising free in-game currency or hacks for popular games like Roblox and Coin Master. The document body explicitly mentions 'how-to-get-free-hair-on-roblox-2021-game-hack' and links to 'netcdn.tw', a domain flagged for malicious redirector activity. The presence of embedded URLs and the lure of free game items strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

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/431946152/how-to-get-free-hair-on-roblox-2021-game-hack In PDF document text
    • https://duoledesign.com/image/data/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/roblox-hacked-client-windows-10_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/roblox-studio-app-free-download_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/114-hacks_GM479516143.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/10-robux_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/anyway-to-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/_GM479516143.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/roblox-install-free-mac_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://duoledesign.com/image/data/files/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F00 21748 bytes
SHA-256: f9e9e0e6b3469316470eee4be9a8fac9d02f01ea539e35a0317a56c61aa292c7
font_01_sfnt_off00005eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB7 19440 bytes
SHA-256: 526724cde6bc47c97002da289a9f95b858f14f71f8bbba163578d631e24a590b

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