Malicious PDF — malware analysis report

Static analysis result for SHA-256 7091c835c93055f5…

MALICIOUS

PDF

47.7 KB Created: 2021-06-10 20:06:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6ad3f9eee179854a21650d0bd618bc1c SHA-1: 855b528ed5b3b743051f8b8cb15bf383e8333343 SHA-256: 7091c835c93055f5a334f9a918da08172b622b31f9aa1e0e2868fd7b2f999be7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous external links, many of which are structured as SEO-friendly URLs pointing to other PDF files. The document body and extracted URLs suggest a lure related to obtaining free items in games like Robux or Coin Master, likely a scam or a method to distribute further malware. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/how-to-get-free-robux-with-a-fake-creditcard-game-hack PDF link annotation
    • https://lib.unitri.ac.id/repository/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/tiktok-free-hit_GM835599320.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-speed-hack-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-free-jump-animation_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000510f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x510F 25556 bytes
SHA-256: 78d4aca15e09de66b2f5267fb04e87d9fbb12ca2c20691ea0cc2c63845ab56a7
font_01_sfnt_off000089db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DB 3096 bytes
SHA-256: d05729863dc05721ada29044278030255eeda038236568e8246a87d3a8573d6e
font_02_sfnt_off00009487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9487 19336 bytes
SHA-256: 3b2a7b9b52b1ba39236c4d7e0d53a11c7280f2afd36efd97ddff6be39e48278c

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