Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57f15866076ec17…

MALICIOUS

PDF

45.0 KB Created: 2021-06-04 03:33:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 22c3d6fbf4868d47ec09403addd61dc7 SHA-1: 1d5945c36562843f69856bfd8823360b47918fcc SHA-256: f57f15866076ec17ba272b50471894b0e9bb1e66965f47dd0f4e017c4c5c4688
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 0.9865

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/431946152/free-account-roblox-with-robux-game-hack PDF link annotation
    • https://lib.unitri.ac.id/repository/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-e-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/collect-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/play-coin-master-for-free_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/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-and-coins-daily-links_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_off0000542f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x542F 24988 bytes
SHA-256: 49f51d8d7872d5dc80d89c3982e70a50ed727664bf78ee05828a784ec529410b
font_01_sfnt_off00008c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C60 18676 bytes
SHA-256: 668999cf9284642de193c24d0ad86807d097fd3a0f3919542938043f8a05e142

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