Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57fc9ad032b9943…

MALICIOUS

PDF

35.1 KB Created: 2021-06-25 18:23:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ee138fb5de3a61ed86d51d6e90e17b3f SHA-1: a9924ad22274b098e9f192b3a890c2944e940a6a SHA-256: f57fc9ad032b9943b69444f9033706be5bdfc56538d801c2850d573e326a9177
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to entice users. It contains numerous links to external websites, including http://netcdn.co/app/431946152/roblox-free-robux-redeem-codes-2021-game-hack, which likely serve as landing pages for scams or further malware distribution. The heuristic findings indicate a link farm designed to attract traffic through SEO manipulation.

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/roblox-free-robux-redeem-codes-2021-game-hack PDF link annotation
    • https://opac.heritagejkt.org//repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/pokemon-go-free-no-download_GM1094591345.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-free-play-no-download-unblocked_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-script_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/robux-hack-no-verification-or-survey-or-id_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-35-13-hack-download_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_off0000309f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x309F 22388 bytes
SHA-256: 57c0c080500dc95f714fdfc8321e629e295f68f141ffef8e305a20366288e628
font_01_sfnt_off0000628c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628C 19628 bytes
SHA-256: 208b546a3789ce28593bf0596e6563c2faeeffdcd8de43e549b8cf30f39bcd76

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