Malicious PDF — malware analysis report

Static analysis result for SHA-256 611e461a39d179e9…

MALICIOUS

PDF

34.5 KB Created: 2021-07-08 07:39:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 49fbffebd6c1c6b5b94c96d10c4997a4 SHA-1: 480dce59b1a9f8c385b9846d778115b4b8f4f7f0 SHA-256: 611e461a39d179e9fd4abe8566b9dcb0aac54f619cfde7ab2839d218c738d51a
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-app-2021-game-hack PDF link annotation
    • https://www.ugericabs.com/uploaded_files/userfiles/files/free-roblox-account-rich-ro-ghoul_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/roblox-robux-hack-android-2021_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/free-roblox-clothes-no-glitch_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/master-hack-coin_GM406889139.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/how-to-run-a-hack-script-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/roblox-download-apk-hack-robux_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/free-robux-no-human-verification-on-ipad_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/hack-for-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/como-consegir-robux-gratis-sin-hack_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/jailbreak-roblox-money-hack_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/master-coin-free_GM406889139.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/roblox-hack-tool-variables-search_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F93 22204 bytes
SHA-256: 30e403b0f22772a5f2ff041b34a2569c4787cd6a9e46c3dfe7f3d3065e00b646
font_01_sfnt_off00006108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6108 19296 bytes
SHA-256: 2b5381b15c79e36d66fe09b00355aceabc7985a3bbfcc95a7c6d6095c4563c1b

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