Malicious PDF — malware analysis report

Static analysis result for SHA-256 36402c01128b11d7…

MALICIOUS

PDF

35.8 KB Created: 2021-06-19 19:08:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 13a7082c0f5f43f54c84d230683d89f7 SHA-1: 4cf684ca179dfd732a0f1fffdeb5ef3ef13a1fe4 SHA-256: 36402c01128b11d72da486ec5366c7d382e6ee3cf4a3c38e1963dfce69e01f49
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDFs, suggesting a link farm designed to attract users searching for game cheats and free items. The presence of a 'download button' lure and instructions for password-protected archives further indicate a malicious workflow aimed at tricking users into downloading unwanted content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.co/app/431946152/birds-hack-on-roblox-game-hack PDF link annotation
    • http://library.stipjakarta.ac.id/etd/repository/roblox-kingadasouth-kingslumber-teleport-cheats_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-roblox-accounts-with-robux-not-used_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-exe-editor-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-roblox-account-with-all-elements-on-elemental-battlegrounds_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-cheat-way-up-volacnoe-wood-tycoon-2_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/pokemon-go-free-gift-codes_GM1094591345.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/hack-para-roblox-2021-pc_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/hack-to-protect-village-on-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
font_00_sfnt_off000033b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33B3 22960 bytes
SHA-256: b9f858f3ab9407a895e40ae0aa84fa9170ba31905b32e263424d8df387689714
font_01_sfnt_off00006759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6759 18952 bytes
SHA-256: 4e9e1b2e9665eb9c76e35487ebe14f3c8d3d79bb717868dde5a9beb64b5d067a

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