Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf05adf6035b642…

MALICIOUS

PDF

36.2 KB Created: 2021-07-06 06:31:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a45c3f6b6684f12566b7b7fa5de9c639 SHA-1: 5171083c3a08fe0e0017f9ca68fc30fb87243998 SHA-256: 9bf05adf6035b642774106fdeb4a18491d14b242b3258c424b54022124393fd3
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/406889139/coin-master-cheat-free-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/wifi-roblox-hack_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/hack-roblox-comment-passer-a-travers-des-murs-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-hack-for-more-cash-in-roblox-tycoon-games_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-hack-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-become-builders-club-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/what-day-does-john-doe-hack-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-mobile-hacks-4-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/hack-roblox-info_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-paint-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-paintball-level-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/el-mejor-hack-para-roblox-marzo-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/pubg-uc-no-verification_GM1330123889.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/hack-into-roblox-acount_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
stream_002_off000036dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36DD 23272 bytes
SHA-256: 31d0f7c1f4c5a0e6d419c9310cd05e7eb6226690fd638d22cbc31bd562fd0d2b
font_01_sfnt_off00006b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6F 18164 bytes
SHA-256: 55eaa8c39803c9dd4095fb3a7b9e7181ae88cc5bd7376e23fd82d846a3866298

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