Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b90330bd2a04e8…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 20:38:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b6348e4946436ea2a8fce0da30e90dab SHA-1: 69e101bb54e82b8cbf4d98f46479e0655e968127 SHA-256: 84b90330bd2a04e85f5666b85135f3e2e5617716de1efc924880847d7e23844f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, masquerading as 'free generators' or 'game hacks'. The primary lure URL is https://netcdn.online/app/406889139/free-spin-coin-master-instagram-game-hack. The document body, though heavily obfuscated, contains references to similar lures and the authoring application, suggesting a deliberate attempt to trick users into downloading further malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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
  • 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.online/app/406889139/free-spin-coin-master-instagram-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-g_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/pubg-uc-not-received_GM1330123889.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/easy-robux-com_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-skins-download-free_GM479516143.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_004_off00005349.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5349 25100 bytes
SHA-256: e577188bc0b357ac397022605518ab9fd1fad2cc5a7b523853cb7e437140a2ab
font_01_sfnt_off00008c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C12 18432 bytes
SHA-256: 88c07ffeddbebcbbf8b09aca39e98b5d20f3ce63d86e440948adeca0846d3a76

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