Malicious PDF — malware analysis report

Static analysis result for SHA-256 51587f8b5154287b…

MALICIOUS

PDF

35.2 KB Created: 2021-06-25 04:29:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1beeb7d6c968ba71f244e5d68999c0e5 SHA-1: 373a62fcd7c2206c77b8b5f037aa4a69e0589d46 SHA-256: 51587f8b5154287bdde9d5880555de7a658184c650639d5b638a40b03984536c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to websites offering free game currency and hacks, such as 'how-to-get-free-robux-website-game-hack'. The document body and heuristics indicate a lure for users to click these links, which are associated with malicious redirectors and potentially lead to further malware downloads. No scripts were extracted, but the embedded URLs and the nature of the lures strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-to-get-free-robux-website-game-hack In PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-admin-on-any-roblox-game-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-tiktok-followers-quick-and-easy_GM835599320.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-3-pastbincom_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/github-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-robux-generator-app-hacked_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/hacks-for-roblox-csgo_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-vip-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-robux-on-roblox-no-verification_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-survivor-script-hack-pastebin_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/daily-free-spins-on-coin-master_GM406889139.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_off00003100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3100 22612 bytes
SHA-256: c7ca3023a8248aee9e499eca280ace3df8ce40d2f551934f47962ad0bcde49f6
font_01_sfnt_off000063be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BE 19304 bytes
SHA-256: c93debd830b422eae21ec10a608c2d09d6fed7207bb4c45cee900aa0b721bbbd

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