Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d214d78ade2fc9…

MALICIOUS

PDF

35.2 KB Created: 2021-06-19 04:49:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6cc3e25710ae62378db993159cd9677a SHA-1: f067062643c7273a0eb18c127e66abcd5021c93d SHA-256: d3d214d78ade2fc9b045870f3071c39ec327db311df90e10fab810e2c90bd75f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/hilton-hotels-hack-roblox-game-hack PDF link annotation
    • https://unsla.uns.ac.id:443/pgsd/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/robloxhack-pro-gamerscom-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-com-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-for-roblox-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-pet-food-hack_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_off00003298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3298 22536 bytes
SHA-256: 1dff076e818602ff6e6701a043bc08c980d7b6f5b07d45711e2f4b1a254ec3d0
font_01_sfnt_off000064f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F2 18880 bytes
SHA-256: c0093af46d34fb190e1d3f3e8915154ed6d58053a3d8c2a56864aec2a9a8a67f

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