Malicious PDF — malware analysis report

Static analysis result for SHA-256 44422ea1e5489fa0…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 10:40:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b588b1b59b2f8478c7ed6a9df7247d51 SHA-1: 5a54a8bbd2415cc0fcc8f6c6be87e7374182c809 SHA-256: 44422ea1e5489fa016704928634f3d1d12ebebb5ee294e04d3646524bfabc541
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/free-spin-today-coin-master-game-hack PDF link annotation
    • http://www.woundcare4heroes.org.uk/uploads/files/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/roblox-muscle-shirt-free-shipping_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-robux-google-chrome-extension_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/easy-hacks-how-to-get-robux-without-buying_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-hack-someones-account-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-get-free-robux-from-bloxmarket_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/robux-free-hack-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/best-sword-in-fight-the-monster-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-robux-live_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-get-minecraft-for-free-on-computer_GM479516143.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_off000031de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31DE 22532 bytes
SHA-256: 472108712beeef60dd96b652bfb83d7ae2149cbbe1ce8e3b2ba07240b2e007ee
font_01_sfnt_off00006449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6449 18528 bytes
SHA-256: 8bd07bce6b8fb06b67799d38f59fb2e9f6a10851cd3df27efaaf0b7d7ca68ce6

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