Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94acc619db261b8…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 11:55:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 789a6e5af150bc306c5226cbdf2a62d3 SHA-1: 664ce4cc0bed899bb80a0b6aa321ed890356b787 SHA-256: a94acc619db261b817c8ebf9271c46b648005e336d8ba7059f3fe6dc63997724
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure related to game hacks and free currency, directing users to a URL hosted on known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. The embedded URL is likely intended to lead the user to a site that will either host further malware or attempt to phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/hack-game-plus-com-coin-master-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-clothes-sites_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-project-jojo-free-items-exploit-pastebin_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-cheats-dlls_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-free-builders-club-generator_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hacks-that-work_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/robloxcom-free-item_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-generator-2021-robux-hack-no-survey-updated_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_off00003182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3182 22460 bytes
SHA-256: f1adfaa6bbda0d891c5d37e12cd983e7be694a3686efef3a9ae5ac5dfe8dce9f
font_01_sfnt_off0000636e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636E 18632 bytes
SHA-256: 3c33294d3414a45f45e6e07bb3b996cc1dbed2c0be7322c0e11ea513fb679d71

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