Malicious PDF — malware analysis report

Static analysis result for SHA-256 b803abc776ff0684…

MALICIOUS

PDF

43.1 KB Created: 2021-05-14 11:07:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4a70cb65f0d64ce7e4ce86694de9ce73 SHA-1: 0ef27e65e7d0dbf5d59552f46686d9b287d5ce2a SHA-256: b803abc776ff06847c4be65530a7530fd6cbfe2760c6cc0491bec13f35692392
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that point to known malicious redirectors and infrastructure. These links are presented as 'game hacks' or 'free generators', indicating a social engineering lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves tricking the user into clicking these links, which likely leads to a second-stage download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/479516143/minecraft-windows-free-game-hack In PDF document text
    • https://leechan.cn/Public/upload/editorfiles/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/can-i-have-robux_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/rbx-earn_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/free-robux-games_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/rbx-place-free-robux_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_off00004c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C80 25216 bytes
SHA-256: 028fca359fec78ee97878d66ffc7348bc7f929a742ccd77bfacec032fdabea92
font_01_sfnt_off00008610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8610 18244 bytes
SHA-256: 17ed61b8d418eb531f0e9f48c5430b9261b703312875c5060f44484e1085bb50

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