Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a830c9a3ea0784…

MALICIOUS

PDF

35.1 KB Created: 2021-07-02 03:13:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a72472792867879d862ba600478ae327 SHA-1: 6dff506821fb25ba1ff7dd0563c408c1fe7292b3 SHA-256: b5a830c9a3ea0784d75023e7a0e68947bd52dbb34e5fbcbc49e6a48891f1e0c0
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 sites offering free game codes and currency for popular games like Roblox and Coin Master. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect users to potentially harmful content or phishing sites. The document body, while containing some obfuscated text, reinforces the lure of free game-related items.

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/free-code-for-roblox-december-2021-game-hack PDF link annotation
    • http://lib.smpn1bambanglipuro.sch.id/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/how-do-you-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/coin-master-free-card-link-today_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_off00003031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3031 22328 bytes
SHA-256: 02857c2d4cc7f8a59a926fed564664a3b9f88751ed7425faefc7074d87a1320b
font_01_sfnt_off00006226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6226 19656 bytes
SHA-256: 3715536948c174873b8b8260fd0cd34f98f8949008619658f698b55177b713a4

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