Malicious PDF — malware analysis report

Static analysis result for SHA-256 884827b13d8630d6…

MALICIOUS

PDF

52.1 KB Created: 2021-06-09 01:31:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1a0970bca01b81fee5d9e033d214f2bb SHA-1: 9a3cbb55d7cbd84e86c741f9192d4a5369780bf8 SHA-256: 884827b13d8630d61cd90006726291c9d6bf6fb6bce20eb6cc11d4e5d4698d3c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are structured as SEO link farms for game hacks and free currency. The document body and heuristics indicate a lure for game-related exploits, such as 'Fe Hacks Roblox Highschool'. The presence of multiple PDF links suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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 https://netcdn.tw/app/431946152/fe-hacks-roblox-highschool-game-hack PDF link annotation
    • http://perpus.i2s-learning.com/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/com-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/can-i-have-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-hacks-in-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005347.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5347 26340 bytes
SHA-256: bddf87777968f19a6187fb5c85ee5e64fae08bdce7e523369385d756f57f519e
stream_007_off0000a736.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA736 18920 bytes
SHA-256: de60eeeb9eb7c4fa00f348240573fe3a862500399e68739a46e24a4c583854ba
font_01_sfnt_off00009077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9077 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A24 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139

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