Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e54c227823f737…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 12:19:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2ad3da48a12cc4e4ed63c6b9da207e0f SHA-1: 3c6f8cfce7ba9a4079a448c2d0a2d7cc2db24d50 SHA-256: 66e54c227823f73777e2264a291ef2492057367083a0fa4f4f66b0d6938afbff
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are presented as game hacks or free generators. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of many URLs under the 'lib.vipklh.ru' domain strongly suggest a phishing or scamming attempt. The document body, though partially corrupted, contains references to 'Real Coin Master Hack 2021' and game-related terms, reinforcing the lure. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially malicious 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/real-coin-master-hack-2021-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-guess-the-famous-characters-answers-cheat-sheets_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-roblox-money-with-cheat-engine-63_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-how-to-hack-welcome-to-roblox-building_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-someones-roblox-profile_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/skisploit-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-robux-codes-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-on-roblox-2021-pc_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-royale-high-school-hacks-de-todo_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-players-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-shirt-templates-free-shipping_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/adopt-me-roblox-hack-money-free-youtube_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-promo-code-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-if-join-group_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/hack-roblox-with-this-edit-cookie_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
stream_002_off00003047.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3047 23056 bytes
SHA-256: fdda2ade62fd67bc3f4f1d6cfbe6546c263e55ddf4d578260d9f0792c684a8f5
font_01_sfnt_off000063d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D7 18480 bytes
SHA-256: f0581d3c4221426b4ac65b4c5e6d902d9e0c9709549af5e1d8ceac9b30b603c6

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