Malicious PDF — malware analysis report

Static analysis result for SHA-256 b868c3232c36bdc3…

MALICIOUS

PDF

46.9 KB Created: 2021-05-12 05:30:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f94f58f094aba83431e26d67380cee9f SHA-1: ab5ef8178566053741f164db5b94f6ce73f8717c SHA-256: b868c3232c36bdc353dc8489d6098a6ed2fbf3efff3846301fcd88cc2b411819
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are disguised as game hacks or generators, such as 'ro-ghoul-script-game-hack'. It also presents a fake CAPTCHA or human verification prompt to trick users into interacting with these links. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a campaign to manipulate search engine results or redirect users to malicious content. The primary intent appears to be luring users to click through a chain of links, potentially leading to further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.xyz/app/431946152/ro-ghoul-script-game-hack PDF link annotation
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/install-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D7 28712 bytes
SHA-256: 8e1e1dd1bad6d94e9ea2d044062c3401600a1d02d70ae09498931fc982e94252
font_01_sfnt_off00008b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B74 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off0000959f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x959F 18120 bytes
SHA-256: 23416a4f265accecd35463abb88f8064d2787c4310c7b82a5b5da3b5a07e9376

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