Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f4a13b2cb49c9b…

MALICIOUS

PDF

34.7 KB Created: 2021-06-27 16:32:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5775cd1e82de534f80c56c74e3a6ec69 SHA-1: fc14cbd7b9a3b5b2963f1ec75ab76b29cdbcfba6 SHA-256: 43f4a13b2cb49c9b8ad9c9adf3940df7504d04777f89e9b9bec77631a64864cf
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'game hacks' and 'free currency' to redirect users to external websites. These external sites host a large number of similar PDFs, suggesting a link farm designed to attract users searching for cheats and exploits. The primary URL http://netcdn.co/app/431946152/how-to-get-free-clothes-on-roblox-2021-on-phone-game-hack is a key indicator of this scam.

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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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.co/app/431946152/how-to-get-free-clothes-on-roblox-2021-on-phone-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-face-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/code-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-robux-fbi-open-up_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/gratis-robux-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/easy-robux-today-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/a-code-froom-free-robux_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_off00002ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC8 22516 bytes
SHA-256: 6db81a816f3b19abd58d7aa8c60a35b23a0a9d9d2714a1492c4f0f560e077739
font_01_sfnt_off000060f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F2 19640 bytes
SHA-256: 6c5fe7b7c8bd3fab83786b2d7f7f0577c9cf23e3d20184234f6d8f2ee1a2eccb

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