Malicious PDF — malware analysis report

Static analysis result for SHA-256 719439f71e43864b…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 23:02:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b16c6e32c7d7552cb7b63b703de4a204 SHA-1: a178a8394331d250234ffbb04790ee26597d9256 SHA-256: 719439f71e43864b58fc90aa17c2fa048f6d6710d19ad64e6e3265085fb8242a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, pointing to websites promising free in-game currency and items. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a call-to-action button further supports a malicious intent. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to potentially malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • 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
  • 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/how-to-get-free-unlimited-coins-in-coin-master-game-hack PDF link annotation
    • http://lc.pustaka.unand.ac.id/repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-invite-friends-hack_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-play-coin-master_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coinmaster-blogspot_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_off0000549c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x549C 25928 bytes
SHA-256: a3869953e0ac2b4c623314433d182265bc40432fcd421a475ec5be7c0650d59a
font_01_sfnt_off00008ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFB 18568 bytes
SHA-256: 17c3bfe6e2b09087d9b288dc5214e8ea6d8a39f73936503e3f6998c4d0212d6e

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