Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1357d77e76cf75a…

MALICIOUS

PDF

35.1 KB Created: 2021-06-29 20:37:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 51c09caab8aecb4dfba67506454d09c8 SHA-1: 7631d1fec5ee102a2566248cfba56aa22700f063 SHA-256: c1357d77e76cf75a0c237e435696128caae1d1f6617f8bf8b59e67db1169e594
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are related to game hacks and free currency generators for popular games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users with deceptive content. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern involves luring users to download or access malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/non-noob-for-free-roblox-game-hack PDF link annotation
    • http://www.perpusffup.or.id/repository/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/how-to-create-a-free-group-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/robux-hack-that-isnt-fake_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-online-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/hacker-simulator-roblox-code_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/how-to-download-nonsense-diamond-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/roblox-games-download-free-pc_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/roblox-troll-players-script-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-free-cards_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_off0000336b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x336B 22424 bytes
SHA-256: 06d90acc4d55888c3cc1a1f5c9162ce97b767a576ce57fe73a4972cffb0f723b
font_01_sfnt_off00006538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6538 18652 bytes
SHA-256: 94501e5e16b3b54511d18d7d090a6d8ab4d7ae42273db0dacd65a3ee6e28ba49

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