Malicious PDF — malware analysis report

Static analysis result for SHA-256 891e949d8e48b0cb…

MALICIOUS

PDF

34.8 KB Created: 2021-07-02 08:45:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b2291b5d98be6a8aa8ed69127e98f969 SHA-1: 6675a963e192500bbcc4c909bee0735272ac7dd1 SHA-256: 891e949d8e48b0cbd6176c1ae67efaa455faaa73e8db65647058ad51ab9022e4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded URLs that redirect to potentially malicious content, specifically lures for game hacks and generators. The ML classifier also flagged this PDF as malicious. The document body, though partially corrupted, contains references to these lures and embedded URLs, indicating an attempt to trick the user into visiting these sites. No scripts were extracted, but the presence of malicious redirector links suggests a phishing or scam attempt.

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.co/app/431946152/free-roblox-ts-game-hack In PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/how-to-get-robux_GM431946152.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/cheat-engine-roblox-not-patched_GM431946152.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/how-to-do-hacks-with-admin-roblox_GM431946152.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/how-to-hack-roblox-with-file-explorer_GM431946152.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/easy-hacks-of-money-for-rocitizens-roblox_GM431946152.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/roblox-c9m_GM431946152.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/moon-active-games_GM406889139.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/roblox-suicide-script-hack_GM431946152.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://klinikdentalestetic.com/ckfinder/userfiles/files/get-free-tiktok-followers_GM835599320.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_off00003326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3326 22068 bytes
SHA-256: 478c7b9da753cb6c4f98a0d9ae17e8a35841426504428d5b7bc03998704c4a88
font_01_sfnt_off000063fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FA 18652 bytes
SHA-256: 2f64670f1c04344c1d1751c0ca75aebbdb3c2083f697f0e6daeaaa08b6e805e2

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