Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb104077f897971…

MALICIOUS

PDF

41.2 KB Created: 2021-05-15 15:51:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cf6629dc62490b8901e6cd7afe0d90e0 SHA-1: 9a4ed0c8f56d95b07004adabc1ed50795947ac25 SHA-256: 5eb104077f897971ff7be3ca6e26e4ac8a0d7a970cf3844ca11e85e5465bdd89
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are structured as SEO-optimized links to other PDF files, suggesting a link farm or redirection scheme. The presence of a "download button" heuristic and the ML classifier's high confidence score indicate malicious intent. The document body, though partially corrupted, contains references to game cheats and hacks, aligning with the observed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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-50-spin-link-game-hack PDF link annotation
    • http://sexythings.gr/images/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://sexythings.gr/images/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://sexythings.gr/images/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/free-robux-hack-no-human-verification_GM431946152.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_off00004929.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4929 23684 bytes
SHA-256: c5091c7afe870984915ca01343445c702dd8ac5b5724b0f59383b6e4ba3ad5b1
font_01_sfnt_off00007e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9F 18196 bytes
SHA-256: 1133898f442132de6b3babc63911783103e8ae6e1bd19e5d3637905fb0848ccb

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