Malicious PDF — malware analysis report

Static analysis result for SHA-256 20df798d79f9f4f2…

MALICIOUS

PDF

34.9 KB Created: 2021-06-20 02:11:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6b9048135f089fea7a3408fae51f5cd6 SHA-1: ceb3751caee210525311007ed667a41889eabff4 SHA-256: 20df798d79f9f4f296d360e6cee530e9ca5d405e7a56d5a4a453d899ab301beb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body and extracted URLs strongly suggest a phishing or scam attempt to trick users into visiting malicious sites. While no scripts were extracted, the PDF's structure and embedded links are indicative of a social engineering attack.

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/how-to-get-free-robux-without-waiting-2021-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/join-for-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-money-on-roblox-rocitizens_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-2021-free-items_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-roblox-autofarm_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-tycoons-on-roblox-with-cheat-engine-64_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-de-invisibilidad-mega-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-free-followers_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hacks-for-initial-despacito-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/i-got-hacked-on-roblox_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_off000030a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A1 21820 bytes
SHA-256: de0d62216328fa5dbdd7032bba268d24073512ceafc246a65c7200c3c1915b8f
font_01_sfnt_off000060ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60CE 19872 bytes
SHA-256: 6a30febfe44b02897202ab27f59a09ea43b98d66dd31d48d1c1a74918f71d382

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