Malicious PDF — malware analysis report

Static analysis result for SHA-256 343d1af5c23935d0…

MALICIOUS

PDF

42.1 KB Created: 2021-05-12 19:00:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0e4ee2757b2e801f8c6e39ec947839e2 SHA-1: 185a401153d70bb4c6fc7c762ef336b03bf30b5c SHA-256: 343d1af5c23935d0704a153e8e96e25ce746f0b63e28a21d4b838f950f4d6c56
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 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-mod-apk-latest-hack-with-unlimited-free-spins-game-hack PDF link annotation
    • https://elibrary.sttar.ac.id/repository/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/www-robux-com_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/coin-master-free-online_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://elibrary.sttar.ac.id/repository/free-spins-on-coin-master-link_GM406889139.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
stream_003_off000047f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47F5 24576 bytes
SHA-256: d3c42b0bfe49c04c05ebf25f8e4714aa40ea47861d7be9f5621efa8d8b0253eb
font_01_sfnt_off00008005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8005 19116 bytes
SHA-256: ec39511f044db0039b033061d0c06de0ea4b06e85abf4e03074bae323e4248a1

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