Malicious PDF — malware analysis report

Static analysis result for SHA-256 959b56b80fad170a…

MALICIOUS

PDF

33.9 KB Created: 2021-06-26 10:12:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8a230f0c22b3cfa7910f52651501cfdb SHA-1: 6da15f6a5c72935363a6e1d061604c7668595e21 SHA-256: 959b56b80fad170a0f52c24f1e04e4f178a116868c4107e37eacd81ea393aeda
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising free generators and hacks for games like Roblox and Coin Master. The primary redirector URL is http://netcdn.co/app/431946152/2021-robux-free-game-hack, which is associated with malicious activity. The document body, though partially corrupted, contains similar lures and URLs, reinforcing the phishing and redirection intent. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a social engineering attack to drive traffic to potentially malicious sites.

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.co/app/431946152/2021-robux-free-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/4-step-way-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/20219-walk-speed-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-on-the-phone_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/aprender-a-hackear-cuentas-de-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/legit-robux-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-games-for-free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/comment-hacker-roblox-macbook-pro_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.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_off00002ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED1 21924 bytes
SHA-256: 1fe6c124084e161692013d74dfa4a7b8d931a955e9445ae99889952d6a02febb
font_01_sfnt_off00005f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F49 19116 bytes
SHA-256: 46b6d0275138487d24ca16497f636915a6275a54ce4394516224517765e536f7

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