Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bbc38aa481edd9…

MALICIOUS

PDF

33.1 KB Created: 2021-07-04 19:57:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 124a004eabf3b9c17978f15b40b0ed35 SHA-1: 810221c591d02c232d849ec1ea4b133bb2e29fff SHA-256: b7bbc38aa481edd9dd999b71c2965f67aa6a7661efdb80b18a9e6520c3a0a73d
142 Risk Score

Malware Insights

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

The PDF file contains numerous links, including a primary lure to 'blox-rewards-game-hack' and a large number of other links disguised as PDF documents. These links likely lead to malicious websites designed to trick users into downloading malware or revealing sensitive information. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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.tw/app/431946152/blox-rewards-game-hack PDF link annotation
    • http://www.perpustakaan.unda.ac.id/repository/phantom-forces-roblox-rank-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-crc7-hack-admin-code_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-free-online-unblocked_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-de-roblox-deathrun-descargar_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hack-unlimited-spins-apk_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-inject-hacks-into-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/pubg-uc-voucher-code_GM1330123889.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/cheat-engine-roblox-this-game-has-shut-down_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-hack-on-roblox-saber-wars_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-plants-vs-zombies-battlegorunds-hack_GM431946152.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_off00002a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A95 22664 bytes
SHA-256: eb5c33df777583ad5513aa5ffd33d30309058a189ecf282df16114bc21a44960
font_01_sfnt_off00005d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7F 18668 bytes
SHA-256: aea007d4b888db5e44469e4a0733284c9a6c01fa70c17fdadd219b1cdd024207

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