Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e256feeb37fee79…

MALICIOUS

PDF

42.8 KB Created: 2021-05-19 02:34:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c5ea563f0940f9855b47113e2c12a095 SHA-1: c94688408723b8140e3287cf260e59d466797560 SHA-256: 5e256feeb37fee7925ab5e387e0fdc7aaa500cf07c3249c15015f9afe4a6a958
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm. The document body and heuristics indicate a brand-impersonation lure, specifically mentioning Microsoft and offering free items for games like Minecraft and Roblox. The primary URL https://netcdn.xyz/app/479516143/how-to-make-a-minecraft-java-server-for-free-game-hack is associated with this lure, and the ML classifier strongly flagged this PDF as malicious.

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/479516143/how-to-make-a-minecraft-java-server-for-free-game-hack.
  • 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/479516143/how-to-make-a-minecraft-java-server-for-free-game-hack PDF link annotation
    • http://geometraperiotto.it/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://geometraperiotto.it/images/free-robux-please_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/roblox-points_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/working-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-daily-free-spins-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_off00004c40.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C40 24668 bytes
SHA-256: 3a970a5a6045dbebddda9c8b4dcd91243faa513f565909021833a6a344d956b3
font_01_sfnt_off00008511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8511 18324 bytes
SHA-256: 8dc142bc7e6132cc43f81519c448dbddadbc7e5fdd921c0c5040c748722dd43f

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