Malicious PDF — malware analysis report

Static analysis result for SHA-256 81094350e0d5fe5f…

MALICIOUS

PDF

33.6 KB Created: 2021-07-04 11:54:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a6ae9a741f075ac8b8a816670d7d5b99 SHA-1: 15542db4b1fe16228afa870785990a3224b6893e SHA-256: 81094350e0d5fe5f6d0ac9f54279a1140462f334f157906c143140958ae4a79f
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a LOLBin command-execution 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 0.9980

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/robux-hack-tools-game-hack PDF link annotation
    • http://global-brand.net/userfiles/files/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/weird-roblox_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/cmd-hack-roblox_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-ice-cream-shirt-roblox_GM431946152.pdfIn macro / runtime command snippet
    • http://global-brand.net/userfiles/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-cheat-in-mining-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/como-instalar-hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/roblox-full-version-free-download_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userIn macro / runtime command snippet
    • 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_off00002ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA7 21816 bytes
SHA-256: 858722bc5c7400e3356d5ba56cfe3a55eff095263a47ddf9a13daed8e19d9039
font_01_sfnt_off00005eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB9 18796 bytes
SHA-256: 97734c8ebbf9bdc7b81322975eb62755299ace721750a42e967de7f23eec8635

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