Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b332533756b776a…

MALICIOUS

PDF

41.7 KB Created: 2021-05-12 15:07:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 19a7cc4dd542db545732a9b36bd93b52 SHA-1: e0b86f7ac7c9e0905ff65c285117138c1dc0c703 SHA-256: 5b332533756b776a5b3f6f8e47f033a762ed5f513200892336cb1ded76afa110
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/431946152/free-roblox-codes-game-hack PDF link annotation
    • https://www.nara.org.uk/uploads/files/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/robux-gainer_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-daily-free-spins-link-today-twitter_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_off00004a43.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A43 24040 bytes
SHA-256: 398f871e126fe5c3a8d6f08d953a5e0ae2bd1fb53c5ffbc725cfaa51e9ecc4d7
font_01_sfnt_off000080ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80EF 18124 bytes
SHA-256: b2c67196fbf991b5753887bae8f4e8d608d4d3a0c15e6a0a5d408089f8491e43

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