Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a48c8e0df4da75…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 15:00:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e3d31500e72145614af86a65888ee841 SHA-1: 2c3ee2d2fbd7c3efdd823147f9e604866c41b1ac SHA-256: d4a48c8e0df4da757cf8360bdc985a370778d8efe7f0dfafd498ad01bd214e19
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 0.9865

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.online/app/479516143/minecraft-java-hacks-game-hack PDF link annotation
    • https://digilib.stieama.ac.id/repository/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/robux-converter_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/wurst-client-download_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-unlimited-spins-hack_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_004_off000052dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52DD 25104 bytes
SHA-256: b88f00352ee1ebb0e082e6b6125b0fe7da9149f642df273e36d12835553ec709
font_01_sfnt_off00008b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B81 18020 bytes
SHA-256: 2aa5f75731ce228eb108c5d7ba78fcf9c19ee4c9e640e1738d5748e499ff9746

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