Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b87258aa6675e4c…

MALICIOUS

PDF

35.9 KB Created: 2021-07-10 01:45:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bca1bd406b7789310d1b46d5450ca778 SHA-1: bd77619932bbfab94a142bf964c652b0a2566657 SHA-256: 1b87258aa6675e4c5340f0cd4a4e49331568ac709f189d37a1c0f7260217c115
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game currency and hacks. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-daily-free-spins-link-2021-today-game-hack, which likely leads to further malicious content or phishing pages. No scripts were extracted, but the document structure and embedded URLs strongly indicate a social engineering attack.

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/coin-master-daily-free-spins-link-2021-today-game-hack In PDF document text
    • https://mbbs.hr/files/site-de-hack-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-a-free-keycard-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-hack-roblox-with-developer-tools_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-hack-com_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/tiktok-free-skin-ml_GM835599320.pdfIn PDF document text
    • https://mbbs.hr/files/try-minecraft-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coun-master_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
stream_002_off0000326b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x326B 23176 bytes
SHA-256: 5689dcbf6cd1554be86255fe6bfa10ae7f412b0ac503162cfcac6ae1b6de284b
font_01_sfnt_off0000666a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x666A 19344 bytes
SHA-256: 2b65a240a25012a699619f5b44b4403fb2d70dbe90fc6d16a4cece9e458288ef

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