Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f12daa2c209a26…

MALICIOUS

PDF

45.4 KB Created: 2021-05-13 22:30:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6a1d3fc8492f399da07b596e3bf966fa SHA-1: 4ef46d0af74b11664d296faf60f53ca396739a09 SHA-256: 23f12daa2c209a262b25dc3730efdb682f60906703ab543e0420bbbd448b8c18
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external PDF files, a technique often used for SEO spam or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests a potential download or redirection vector. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious workflow, likely aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/431946152/roblox-hack-game-game-hack PDF link annotation
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/free-roblox-templates_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/rewards-robux_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004921.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4921 25888 bytes
SHA-256: 3f5b3a1660e834a0d7b2823c74dccddad45c64a311fc8d65e46a26fa8c0c202f
font_01_sfnt_off0000849b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x849B 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E85 18440 bytes
SHA-256: ebafd2a9612b8145e5e0fd0fae0a522d36691e15007df27d7d415ea6fce26a90

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