Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebe4133c3b7122f…

MALICIOUS

PDF

41.9 KB Created: 2021-05-13 08:32:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9b249d1bc49d9eafa0477d1885672a33 SHA-1: 9759c43f3f70b8836b4b48036f2cf7122dddf3a2 SHA-256: 8ebe4133c3b7122f98468a96998b97367b01ea1204daa1e48d5e1fcd13a0d0b6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to websites that offer 'free generators' or 'hacks' for popular games, such as Coin Master and Roblox. The heuristic firings indicate that these links lead to malicious redirectors and a large number of SEO-optimized PDF links, suggesting a link farm designed to drive traffic to potentially harmful sites. The document body and embedded URLs strongly suggest a phishing or scam attempt to trick users into visiting malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-free-spins-link-today-2021-game-hack In PDF document text
    • http://baofrance.com/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://baofrance.com/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://baofrance.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://baofrance.com/images/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://baofrance.com/images/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://baofrance.com/images/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://baofrance.com/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://baofrance.com/images/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://baofrance.com/images/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://baofrance.com/images/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://baofrance.com/images/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://baofrance.com/images/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://baofrance.com/images/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • http://baofrance.com/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://baofrance.com/images/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://baofrance.com/images/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • http://baofrance.com/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://baofrance.com/images/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://baofrance.com/images/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://baofrance.com/images/how-to-get-free-robux-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_003_off0000473b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x473B 24828 bytes
SHA-256: f22fd22febd56dbe9f5c1eec83f30ffc0d89855e2700e6569a9e509e502ea3d1
font_01_sfnt_off00007f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F70 18812 bytes
SHA-256: 209d45ed87732d827821998a5283e56b95c39a3af4032faff2e6da7d3e76f78f

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