Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a5b63135a81b3e…

MALICIOUS

PDF

35.7 KB Created: 2021-07-07 06:38:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cbd21b356d2a1cbc76d9580116eb17ad SHA-1: ab2b06e5f5bd3fbbf8494ccd1abfe1780dce7959 SHA-256: 25a5b63135a81b3e2a09c093bc33d802e30c3344b1a2d8c6dcdbc8edc1b8b174
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to external websites that promise game hacks and free in-game currency. The primary lure is for 'Coin Master Free Coins And Spins', with numerous other links pointing to similar game-related exploits. The document's structure and content strongly suggest a phishing or scamming attempt designed to drive traffic to potentially malicious or ad-filled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-coins-and-spins-app-game-hack PDF link annotation
    • https://www.knjizara-harfa.rs/files/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/rbxdemon_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-admin-commands-dll-hack_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-generator-co_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-do-i-log-into-my-hacked-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hacks-for-roblox-phantom-forces-2021-august_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/earn-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_off000033dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33DC 23388 bytes
SHA-256: 05b5ed39e78e8059184efa30389789b027d5fe8d44bc3194bd519eaf088c5676
font_01_sfnt_off0000689a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x689A 18348 bytes
SHA-256: 8f4e14d352258b2a04c4750a5c5e6ee18e44525ef82eed3820f54d352c64eef8

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