Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec9cebb344abcd2…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 23:16:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d026e336b68ff3c273082a75150cfbe0 SHA-1: 5e22065703c3628746a17d670946ec5d7c83ba48 SHA-256: 4ec9cebb344abcd258fce735ef8ebbec3c93a57c7b0343be141c0a98a400228b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are part of a link farm designed to host further malicious PDFs. One primary URL, http://netcdn.tw/app/479516143/free-minecraft-packs-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a lure for game-related cheats and items, a common tactic for distributing malware. No scripts were extracted, but the extensive link farm and redirector infrastructure strongly suggest a malicious intent to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/479516143/free-minecraft-packs-game-hack In PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-ban-people-in-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/roblox-apocalypse-rising-shenanigans-mod-cheat-code_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/google-how-to-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-roblox-accounts-2021-april_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/roblox-free-inventory_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/hacks-de-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-robux-complete-free-hack_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-get-free-robux-change_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-get-free-robux-inspect-2021_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-get-free-schrt-in-robux-copyng-it_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/roblox-undetectable-cheat-engine_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-hack-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-robux-generator-ios_GM431946152.pdfIn PDF document text
    • http://mtsn-baranti.com/perpus/repository/free-robux-generator-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_off00003205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3205 22168 bytes
SHA-256: 14ce77d9622954ddcc64fae9c59727cbf44baef9cf795f609aa6e855d0b16322
font_01_sfnt_off0000629e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629E 18180 bytes
SHA-256: cd26da6d7e7da25a67fce542645decc56f078d6b90bb5ba2dacc5a3e21e5a79e

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