Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a59a38ad0eb60ac…

MALICIOUS

PDF

43.5 KB Created: 2021-06-03 04:08:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5e3e0a157ff87e349824af1ed2ab1921 SHA-1: 7f80b7c9f52961c7478989fff74467951f8dc68e SHA-256: 1a59a38ad0eb60acb0bb82875695f08015065416b8a73c18f08f3d21aa22f2bc
142 Risk Score

Malware Insights

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

This PDF file contains numerous links, including one directly to a 'coin master hack' generator, indicating a lure for potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of external links, likely for SEO manipulation or to host further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.online/app/406889139/coin-master-hack-version-33-2-game-hack PDF link annotation
    • https://elibrary.sttar.ac.id/repository/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/roblox-assassin_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/united-gaming-net-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/get-free-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/haktuts-free-spins_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_004_off00004ef5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EF5 24804 bytes
SHA-256: 3c69c589ab11b5701c549b6f26b0eb534712688d9785adfd75687e4ee57f2758
font_01_sfnt_off000087b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B7 18148 bytes
SHA-256: d55bdc07145c3c11353dea5b6bba8be921da8dafe02cc0c0734124f937622e97

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