Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a72ff6c4e73e89…

MALICIOUS

PDF

42.7 KB Created: 2021-05-11 09:01:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0ea592739e8c9044860d5e4d9506ca5c SHA-1: 4918e46be4189dd870208e2426de4c6cd1d8721c SHA-256: e4a72ff6c4e73e89ada9a085cdc46f092ed259e64ad254f438614f716247b1bb
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 0.9971

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.xyz/app/479516143/how-to-download-minecraft-hacks-game-hack PDF link annotation
    • https://lib.unitri.ac.id/repository/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-windows-10-mod-menu_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-hack-no-verification_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
stream_003_off00004b70.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B70 24824 bytes
SHA-256: 3e9acf1e08d214b3f2d6d7927f52733352164b35e957e0f862068d7d13e752fb
font_01_sfnt_off0000842f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x842F 18460 bytes
SHA-256: 201e47ea1bc759f6ab60629fe707baeeae03fa46224cbd2752ecc215bd4960d2

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