Malicious PDF — malware analysis report

Static analysis result for SHA-256 e710dce85ec31179…

MALICIOUS

PDF

34.0 KB Created: 2021-06-22 13:17:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2aa22517683ec96e9723438b7a9ea2be SHA-1: 9b71b1389288cbb0076b49799108bb97b2447448 SHA-256: e710dce85ec311792219904b564d7b360b6604edeabe6e91c96f530057285c4f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, many of which are SEO-optimized PDFs promising cheats and free items for games like Roblox and Coin Master. The ML classifier and the PDF link farm heuristic strongly indicate malicious intent, likely to redirect users to download malware or engage in phishing. No scripts were extracted, but the document's structure and content suggest a lure for initial access via a malicious attachment.

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/how-to-hack-on-roblox-assain-game-hack PDF link annotation
    • https://admin.9credit.vn/data/files/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-hack-accoutns-on-roblox-october-2021_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-free-gold-cards_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-robux-please_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-robux-hack-no-human-verification-and-no-survey-2021_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/best-free-spins-link-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_off00002f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F42 22120 bytes
SHA-256: ab63e651c6fa14b67c9f53850370f4ec8fba61b8a50835e547b837c4e1e8959a
font_01_sfnt_off00005ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF4 18940 bytes
SHA-256: d416c1d3373fcf4252482cc1f3ee65b05b5d4522e369c33d9306344192d05b5e

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