Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21a7b3e270cbdf4…

MALICIOUS

PDF

34.9 KB Created: 2021-07-08 01:31:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 513313362fff8fba9ab43e65c6839fa2 SHA-1: 250dfefbfcc0be6cd7ed76abbfc1fcf01f7f6a83 SHA-256: c21a7b3e270cbdf40e75d0e4b822c935709227bc51f2fb3f37f1b0013e7bd4dd
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a prominent link disguised as a 'free generator / game hack' lure, specifically mentioning 'Free Robux'. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or malware distribution attempt. The embedded URL http://netcdn.tw/app/431946152/free-robux-ad-game-hack is the primary indicator of compromise, likely leading to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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-ad-game-hack PDF link annotation
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/minecraft-client_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/rbx-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/roblox-free-clothes-download_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/generetaror-roblox-free_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-hack-generator-tool_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_off0000330a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x330A 21964 bytes
SHA-256: b8442bc6abe77503979db73fd8bf6165478d3c6c20ef5641599019646ad2999e
font_01_sfnt_off000063c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C5 18888 bytes
SHA-256: fed93a57f9ebc49998933260645548d38829a68d40f64c31f5643833283864c8

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