Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ce5dfe70177c88…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 12:01:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 08c89573d104c925fd2cecfc502f4667 SHA-1: 22a761e74b31796a0dead2c131b0910c9bebdf6f SHA-256: 79ce5dfe70177c88aa9c57507a4ce1e7fa57c954c160180581ec601e4fd02014
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many of which are SEO-optimized and point to pages offering game hacks and cheats for popular games like Roblox and Coin Master. The primary URL http://netcdn.tw/app/431946152/roblox-character-free-game-hack suggests a direct download or exploit attempt. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.tw/app/431946152/roblox-character-free-game-hack PDF link annotation
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/hack-robux-free-no-verification_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-past-free-robux-roblox-hack-survey_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-levels_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-cheats-card-codes_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-god-mode-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/instal-roblox-free-and-easy-download_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-invisibility-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-drunk-walk-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/dbaf-hacked-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/what-tiktok-free-views-without-verification_GM835599320.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/https-wwwrobloxcom-games-202120217-sponsoredfreerobux2021-about_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-jailbreak-free-vip-server-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-hack-on-roblox-2021_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_off000031be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31BE 22148 bytes
SHA-256: 763d097520bdddde1d0dd13acfc0410d1c1a53755e3f4d2e9f38d4075cc6ece8
font_01_sfnt_off00006292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6292 18920 bytes
SHA-256: b5474294296d9f5b9ea12a54036d97a64d26d44eeb49bdd78dad108d1826d115

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