Malicious PDF — malware analysis report

Static analysis result for SHA-256 16924c0369ac6c0a…

MALICIOUS

PDF

34.6 KB Created: 2021-06-19 00:38:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e1512a7ad3970489f59ac67a64f31aad SHA-1: 51dba605defc1c3b92384ee2cc81613fb929fc38 SHA-256: 16924c0369ac6c0acf816bb7d89a7c0405ccd6196c94fb4a2e0f43961c1e0a4b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external resources, many of which are algorithmically generated and point to game-related cheats and free items. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to redirect users to download malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.co/app/431946152/cheat-fr-roblox-game-hack PDF link annotation
    • http://repository.ummy.ac.id//repository/more-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-robux-no-playing-games-or-human-verification_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-ways-to-cheat-money-on-vehicle-simulater_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/the-only-working-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/howto-find-people-ingame-in-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/earn-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/edm-reaper-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/btools-hack-roblox-download_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000307c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x307C 22412 bytes
SHA-256: 5144e72ef9a9c4f2ac40446066a396ee30d5243c4ddd12ad20aa96a91fd99b5c
font_01_sfnt_off00006291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6291 18920 bytes
SHA-256: 37a9b62c1ecabb298c8daed0be1d03b65511d41a09ca0a9a0ea5de7c9174217d

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