Malicious PDF — malware analysis report

Static analysis result for SHA-256 7961ae9dbe6eaba3…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 06:24:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3290011c88b9aee8fbf69411f6f1a8e5 SHA-1: 6b49dbe85ddbb7cdba56550b92c8dbeda31f609b SHA-256: 7961ae9dbe6eaba32b04d1bfbe238ed8e34f15f87ab5ea9bfdb5f84ef7efe9f8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, including a critical redirector link to 'http://netcdn.tw/app/406889139/60-free-spins-coin-master-game-hack'. This URL is associated with malicious redirector infrastructure, likely serving as a lure for game hacks or generators. The document body and heuristics confirm a phishing attempt related to game cheats and free currency, indicating a social engineering attack. No scripts were extracted, but the presence of malicious links and the lure suggest a phishing or scam campaign.

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/406889139/60-free-spins-coin-master-game-hack In PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-free-robux-by-just-watching-a-video_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-no-robux-account_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/wurst-18_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-hack-cheat-engine-63_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-robux-promo-codes-list_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/robux-best_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/hack-to-upgrade-pets-in-ninja-legends-roblox_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/hacks-of-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/boys-roblox-pajamas-free-shipping_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-robux-generator-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
font_00_sfnt_off00002fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB3 23052 bytes
SHA-256: fecdb9e37d9406f776bcb60643da9906501c851dfd6654e4ea60437c53c7f23c
font_01_sfnt_off00006348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6348 18516 bytes
SHA-256: 9c110acbe1bdea99191041174f21e13522cf76b2385bd88ae7104caf738e615a