Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0c213d6f6b6d44…

MALICIOUS

PDF

41.9 KB Created: 2021-05-11 00:37:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 91057c4018ac28a8a1e6c060a483e6a2 SHA-1: 104b707daf4b699efcddc2802d3f26117a26c245 SHA-256: 1a0c213d6f6b6d44b56c3bb6f34b1fa1be309e21e2f9deaa6d9fe0ab12db5942
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a malicious lure, employing a "free game hack" theme to entice users. It contains a large number of external links, many of which point to SEO-optimized PDF files related to game cheats and free currency. The presence of a remote support tool lure, combined with the ML classifier's high confidence score, indicates a strong likelihood of malicious intent. The document likely aims to trick users into downloading further malware or engaging with potentially harmful services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.xyz/app/479516143/minecraft-for-ps3-free-game-hack PDF link annotation
    • http://cosver.eu/images/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/rbx-com_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-coins-coin-master-link_GM406889139.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
stream_003_off00004a17.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A17 24640 bytes
SHA-256: 045b183748d9b8f8aee7053b305b128d273929d78bc573d00bce4288abed49f8
font_01_sfnt_off00008221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8221 18040 bytes
SHA-256: 09ea3dd4b047373bae803d33bdd33c544def5dd2be81e44fdc518589b4c31272

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