Malicious PDF — malware analysis report

Static analysis result for SHA-256 8688b1502575ff0f…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 07:14:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c3d602c91c0f68c488d2cadab9a44998 SHA-1: 6ab7a77c5b5cf1b67f2a7453e06d0bd30546af5f SHA-256: 8688b1502575ff0f92cc742d81b78b89437bda5f8133c016d869788bd3718953
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The primary lure URL is http://netcdn.tw/app/431946152/free-robux-kid-friendly-no-human-verification-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

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/431946152/free-robux-kid-friendly-no-human-verification-game-hack In PDF document text
    • http://library.acehresearch.org/repository/roblox-hack-robux-download-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-hack-without-human-verification-and-survey_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/what-player-got-banned-for-using-free-models-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/hacks-for-roblox-apps_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-do-i-get-items-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/script-fly-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-noob-clothes-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-private-server-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-2021-today_GM406889139.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_off0000316c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316C 22288 bytes
SHA-256: af2dd1f16c3eaec80a35e0b2d50ff44838b939cac3d99469e5a52a781838641c
font_01_sfnt_off00006290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6290 19760 bytes
SHA-256: 81aab0412cfb0a87b1895216bf4af503bb533c0e0c6228ebd3d86b300273636c