Malicious PDF — malware analysis report

Static analysis result for SHA-256 20efa5d66b191cd4…

MALICIOUS

PDF

33.1 KB Created: 2021-07-19 13:35:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: acd1a1f12dd01eb78a9144398ece6af7 SHA-1: 6ae37d60d3f17f430b0861b96c5c393f95ef0e05 SHA-256: 20efa5d66b191cd4d06e6c68a1833bf122b6e8bee2615e6b1cec610ede771972
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one that redirects to known malicious infrastructure. The document body and heuristics indicate a lure for free game hacks or generators, likely intended to lead users to a phishing or malware download site. No scripts were extracted, but the presence of malicious redirectors and the lure suggest a phishing or initial access attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/479516143/can-you-make-a-minecraft-server-for-free-game-hack In PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/tiktok-likes-free_GM835599320.pdfIn PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/how-to-get-minecraft-windows-10-for-free-2021_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_off00002fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA8 21840 bytes
SHA-256: fffe2a810c06101c130e60aabd9dcfe3381f065cbbcff20e9d6695c6555d2b93
font_01_sfnt_off00005f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8B 18296 bytes
SHA-256: 7b2a5025a6b2eafbb08597cb19c0e2dd24287b9ce61b32a45f1f6eb7f3859dea