Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26ce8f9b823c19d…

MALICIOUS

PDF

47.4 KB Created: 2021-06-11 06:49:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 56b9f03379ef5ba223c9bc0d443d2bc7 SHA-1: d8be453d09fdc7c72e8022c4421fec0614d0fb4f SHA-256: f26ce8f9b823c19d20b1a456ebe45d1a7e37e9aa4dba2c57d3532da87cdadcf0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users to external sites, including a known malicious redirector. The document body and heuristics indicate a scam related to free in-game items or hacks, likely intended to lead users to phishing or malware download pages. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • 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.
  • 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.tw/app/431946152/free-robux-2021-legit-feb-unpatched-instantly-no-wiat-game-hack In PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-afk-saber-simulator-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/hacks-para-cualquier-juego-de-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/dark-dominus-roblox-codes-free_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-pe_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/does-roblox-have-free-snacks_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-drivers-upgrade-free_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
stream_004_off00005339.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5339 27296 bytes
SHA-256: e0974d7c298a4017701bcb2feed7faca45f02c73b5ace100413a01f4782a143c
font_01_sfnt_off000090da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90DA 20308 bytes
SHA-256: 49718855be19ecf4e550c7619e93c6160e9adf4acc4a4103cc88574b38d6da54

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