Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ec504a2d8fc65d…

MALICIOUS

PDF

47.8 KB Created: 2021-06-03 22:32:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1d8efb537ec27a9b8ea41e8e86347317 SHA-1: c8e8e9c858a5dc5d8aa19231a795b1c9a285267d SHA-256: 65ec504a2d8fc65dee250d5b761a410b955b402ed3ae3de56c0a12d223f3b1a4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous links designed to lure users to external websites, masquerading as 'free generators' or 'game hacks'. The primary link redirects to a known malicious infrastructure, indicating a phishing or redirection scheme. The presence of a visual download button further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a potential for exploitation or further payload delivery.

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.online/app/431946152/free-robux-offers-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/pokemon-go-free-game_GM1094591345.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-roblox-lumber-tycoon-2-money_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-stuff-on-roblox-2021_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_off00004fee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEE 32540 bytes
SHA-256: c1dee477a543eaabc29a0b1b5698c4b8b90d71c6e818506d898d005e853d6018
font_01_sfnt_off00009942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9942 18012 bytes
SHA-256: 2fb616bca13af88ff89276a9b2d2fcc075dc4ebb9507e4cf45ab0719cef726f6

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