Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4ae88563ddd67d…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 06:09:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ffad9c1bbbce35be532e6eaa8c1170f2 SHA-1: 4fb3d008498031404eaa5f5144897bde08dec057 SHA-256: fc4ae88563ddd67deaa81a9786e1cd0254161432a5d7ef0526d3d8d3b8fbab98
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector, that promise free game hacks and currency. The primary link, http://netcdn.tw/app/406889139/free-daily-spins-coin-master-game-hack, is designed to lure users into clicking through to potentially harmful content. While no scripts were extracted, the presence of malicious links and the lure of free items strongly suggest a phishing or 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/free-daily-spins-coin-master-game-hack In PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-with-console_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-net_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-free-master_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/did-biggie-get-robux-free_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/slurp-hack-roblox_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/roblox-player-apk-free-download_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/www-roblox-com-free-items_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/roblox-ban_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/pokemon-brick-bronze-roblox-where-to-find-exp-share-free_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/como-descargar-hacks-para-roblox-red-boy_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/roblox-how-to-get-free-robux-proof_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-legally_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/100-free-spins-coin-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
font_00_sfnt_off000030dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30DD 22468 bytes
SHA-256: 1552e37e5338dd69426bc17f3f05f931c07156394e3b4eec033a0970100d0e27
font_01_sfnt_off000062fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FB 18596 bytes
SHA-256: 4ad8fd882529be3d23a027a1092be38fd3a881cb86878c09c64331b24aa9a906

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