Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ea404422670c25…

MALICIOUS

PDF

42.2 KB Created: 2021-05-13 13:05:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e642b655604e35e9de045f36d94f7d26 SHA-1: 0a04e67592b6328499c19b068c65b5c31ec86f34 SHA-256: 61ea404422670c257c5c7aa246d65fb341eb9ed04be027fdbffb6ad96f12c020
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to websites offering game hacks and free currency, identified as malicious redirectors. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

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/406889139/coin-master-level-3-game-hack In PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • https://www.kkaccessoriesuk.com/uploaded_files/userfiles/files/where-can-i-get-free-spins-for-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
stream_003_off00004b16.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B16 24560 bytes
SHA-256: 3521373b4263a707a25d885691db81faca7e302f5f8c4a1d48e4fcea62d55721
font_01_sfnt_off0000837e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x837E 17908 bytes
SHA-256: a428fa0e82fb1a017628b8c3c9413d7b41dec9b75eabf42be534ee8224f0c962

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