Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec7143cb99714cc…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 16:37:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f1540372e28d7ea972d80cc708fb4d46 SHA-1: bbc56a4674f72173b7e248738d1d84f1ef9e4607 SHA-256: 3ec7143cb99714cc39b6cec4aa4902e142dc21eebfb9858405bb34984147dbf9
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 0.9980

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.tw/app/431946152/free-robux-hack-no-verification-game-hack PDF link annotation
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/coinmaster-hack_GM406889139.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/how-do-i-get-free-robux-in-rolblox-2021_GM431946152.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/hack-menu-roblox-download_GM431946152.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/minecraft-free-install_GM479516143.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.maputripuitalaga.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-mobile_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
font_00_sfnt_off000030a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A2 22360 bytes
SHA-256: c4d0f5543328fdb87f7131702a3d0a09b644f1c143de5a2db9a84f386c3237ff
font_01_sfnt_off00006257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6257 19244 bytes
SHA-256: 96540bd7c84d60e769713d590412c745bf113fce47b0f54684cca50d2dde6ca8

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