Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1a08b003e98aae…

MALICIOUS

PDF

41.4 KB Created: 2021-05-16 17:19:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c448877971287026057fdce7f18bb516 SHA-1: 6a0d42d36fe709f4cc780ed194f3d74b419f185c SHA-256: fd1a08b003e98aaea7d17d5f8025929680a34945408e652c168cbd0c7ab30d04
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/406889139/coin-master-hack-2021-no-human-verification-game-hack PDF link annotation
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/easy-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/hack-minecraft_GM479516143.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/robux-app_GM431946152.pdfIn PDF document text
    • https://min22.elearningjkt.net/__statics/gudangsoal/files/fan-page-coin-master_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_003_off00004920.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4920 23496 bytes
SHA-256: 523f422a74c419c2ed00b9a99db02bd4a2a92e61a9c33368b6a359611c4b0954
font_01_sfnt_off00007e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E19 18652 bytes
SHA-256: b8f105c40d85849bb980b8b1f3fc80cc73964bf3899fc8976168334accd52214

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