Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb9be90e7fb83a9…

MALICIOUS

PDF

49.7 KB Created: 2021-06-11 06:03:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 048619df4deaab067729f91c1581d8b7 SHA-1: 2f13f885030572d908233489e44841fd7a72e857 SHA-256: cbb9be90e7fb83a94afde5bdfb0a814d69993ff7da8058fc959cf1f245f4d885
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9796

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/how-to-use-cheat-engine-on-roblox-2021-game-hack PDF link annotation
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-coins-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/can-you-make-a-minecraft-server-for-free_GM479516143.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-spin-software_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51E2 25920 bytes
SHA-256: e77de5d332f603d81aad309727393755e06b78eebcad2a4a4555cf09b4bee66b
font_01_sfnt_off00008ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC2 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD4 19444 bytes
SHA-256: 7dd061c360622dbe2e444b2d7e7a98d9c75ef28844c531c1ae721f995fa3fb06

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