Malicious PDF — malware analysis report

Static analysis result for SHA-256 821040ef25e92e52…

MALICIOUS

PDF

47.0 KB Created: 2021-05-16 21:54:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 54791bc6f3ab5a99bfc61224af3fe19e SHA-1: 51d5d805ad00f7323a1d363852ad6a58742608b9 SHA-256: 821040ef25e92e52b3840d1032937c9ecd5e4aea9cabec86054d981b0722502a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically promoting "free generator / game hack" content. The primary redirector URL is https://netcdn.xyz/app/431946152/download-apps-for-robux-game-hack, which likely serves as a gateway to further malicious downloads or scams. While no scripts were extracted, the PDF structure and embedded links strongly indicate a social engineering tactic to trick users into downloading potentially harmful applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 https://netcdn.xyz/app/431946152/download-apps-for-robux-game-hack In PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/robux-rewards_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/whats-robux_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A9D 27472 bytes
SHA-256: f619061b6cf4d4d366188fd620aa8cb55f728c9e9bb822973b2cb0e97196ed5f
font_01_sfnt_off0000883f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x883F 3112 bytes
SHA-256: 471f662098e83c5562504503f5e7603b336ca0957605358090bb98e15c7aed80
font_02_sfnt_off000092f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92F9 18996 bytes
SHA-256: ea235c61f7ee6ff97cb8e2e4b8381115f9ce59fc272e8f2939e83a9622de1179

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