Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfac18325845613d…

MALICIOUS

PDF

45.9 KB Created: 2021-06-04 00:04:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4c03122c68394620fdb5e7444bc690bd SHA-1: db50a7177493caf0943765f1e85b97f4656bb17f SHA-256: cfac18325845613dc815e3724b2e77d284b199722745fc0eb528a1b81c7bac7a
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 0.9864

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 https://netcdn.online/app/406889139/coin-master-daily-free-spins-2021-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info//repository/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-lovenet_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/rbx-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-tiktok-followers-just-username_GM835599320.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-version-download-2021_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
stream_004_off00005292.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5292 26984 bytes
SHA-256: 7d0aad15a4222c154422bb5109884c9850e440500038a591b28e3425a2f6a8b7
font_01_sfnt_off00008f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F79 18708 bytes
SHA-256: 0e09573a858265cfc65c534eb28458a66078312e2bd7bae94317e03ea41fcd19

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