Malicious PDF — malware analysis report

Static analysis result for SHA-256 974f4090ecd6b9eb…

MALICIOUS

PDF

33.3 KB Created: 2021-07-06 04:26:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: da51f3f20e0985ae5063a50c8db2ca79 SHA-1: dc288a0d2ba4ca2f671376eeadb9959b105235b6 SHA-256: 974f4090ecd6b9ebde3f795eb864fe0c3af2af2bfcc8a963b933fb0276ecc164
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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.
  • 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/406889139/coin-master-hack-without-root-game-hack PDF link annotation
    • http://libnh.stikesnh.ac.id/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-hack-on-pc-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-and-builders-club_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-earn-robux-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/script-hack-prison-life-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robux-online-free_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/codes-for-2021-november-for-free-robux_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_off0000336f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x336F 22828 bytes
SHA-256: a38a52647c5d20ff6f9a4c0754a638561831639b46d44a911b97b9f22ef8cd8d
font_01_sfnt_off00006693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6693 18508 bytes
SHA-256: e8f0f552a12aa69e994226cbfb6b4b1f2303cc9b7cfd31b3220157286440ebf7

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