Malicious PDF — malware analysis report

Static analysis result for SHA-256 23732dfd1049fbc3…

MALICIOUS

PDF

41.7 KB Created: 2021-05-15 16:18:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 590aa7fddf52e0767522876ebe35d49e SHA-1: 59e0abe287b292f8a3cc416d14d6bcd092f41409 SHA-256: 23732dfd1049fbc3c25d2d1176d77337b3bb30738aa5ea8282471e12eb70ae0e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure and sites offering game-related cheats and currency, such as 'coin-master-freebies-game-hack'. The ML classifier and specific heuristics for malicious redirectors strongly indicate a malicious intent to lure users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-freebies-game-hack In PDF document text
    • http://yochin.org.tw/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/give-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-com_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004946.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4946 25136 bytes
SHA-256: 10c30b45e3d561aa0382847efc24eef6c5f585ce7d95c5b5329cf422befc68ac
font_01_sfnt_off000081a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A4 17868 bytes
SHA-256: 372242737ab0d4eb2ebe68796557a8f5e24de81c1de3b0fc8c95edc19f938617

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