Malicious PDF — malware analysis report

Static analysis result for SHA-256 0847e881a396f044…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 12:41:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 26a9ed159b8d4db7a671667df0410363 SHA-1: ac73d92cbcacb288f5019c69c1232b0c3117439f SHA-256: 0847e881a396f044e2684791d92e1ab7767e721b73d559eae7c5f4770eaa3029
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are disguised as methods to obtain free in-game currency or followers. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of such links, and 'PDF_CAPTCHA_LINK_LURE' suggests these links lead to CAPTCHA-themed pages, likely to trick users into completing surveys or providing personal information. The document's content and structure strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/835599320/free-tiktok-followers-no-survey-or-verification-game-hack
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/wahoo-free-robux_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/coin-master-apk-free-download_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/coin-master-free-coins_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/coin-master-free-raid-link_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/coin-master-tips_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/hacks-to-get-free-robux-2021_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/pubg-uc-kaise-khariden_GM1330123889.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/swat-for-free-on-jail-break-roblox_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/free-roblox-card-codes-not-used-2021_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/sb-game-hacker-coin-master_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/coin-master-hacksco_GM406889139.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/orewards-com-free-robux_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-captcha_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/how-to-hack-robux_GM431946152.pdf
    • https://www.virajafashionista.com/uploaded_files/userfiles/files/roblox-hacking-for-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030b9.bin
3a3001705e6e337c445eae94d97f2017d6e0ab5b283ce329d2fc726803b10988		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30B9 22536 bytes
font_01_sfnt_off00006306.bin
fb49112b3290fbfe94373ba6afd355905b25245109e496c6a44e9d10670d3ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6306 18776 bytes

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