Malicious PDF — malware analysis report

Static analysis result for SHA-256 657794a026a95e1e…

MALICIOUS

PDF

35.3 KB Created: 2021-07-04 02:26:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cf91789d7a2f4eb6d991a5ebcd788403 SHA-1: 8d63c1231cb4a92f2a907a50c8e452a417327cd2 SHA-256: 657794a026a95e1edc38d2fa9757d045c40852ad6a182de5814ad5398138168f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, masquerading as 'game hacks' or 'free Robux' generators. The document body and embedded URLs strongly suggest a phishing or scam lure designed to trick users into visiting potentially harmful websites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/how-to-get-free-robux-without-verifying-2021-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-how-to-hack-in-your-game-hack-gui_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/labyrinth-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-tiktok-likes-and-views_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/toolbox-apk_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/tiktok-free-likercom_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-not-fake-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-websites-that-scam-you_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-fast-and-easy_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
font_00_sfnt_off00002f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F91 22440 bytes
SHA-256: 8844dc3610446be621b88b9a8362f756accbf9ac8b374057a6b952360d8f05b3
font_01_sfnt_off00006185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6185 20184 bytes
SHA-256: da7d406aba47eea6317da3ede96973437af681d442b83efbb40dfbc95f86b21f

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