Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a78531145ff691…

MALICIOUS

PDF

44.0 KB Created: 2021-06-09 12:27:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: abb854ffafd13b5d2efe539ff792563f SHA-1: a0baeac1f65abb0f8b5ce19243a5a86c0c402713 SHA-256: e3a78531145ff69126d358756130d38f4d284255590cab64f128d32da37807e8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF repositories for game cheats and free currency. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests a deliberate attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-prison-lifev2.0-cheats-game-hack PDF link annotation
    • http://lib.smklabor.sch.id/repository/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hacks-for-roblox-admin_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/claire-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hackaron-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robux-earning-sites_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-2021-app_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-link-2021_GM406889139.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ecf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ECF 24384 bytes
SHA-256: e8226d7edca5f13c3c415f5a29b619de1d2fbe6065cd7e6ee3594a59343bfcbf
font_01_sfnt_off000086d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D4 19032 bytes
SHA-256: cb63cf0b1fa439e4ffb879b425e3a0ce07cf460fccf7f82edb79382d8e04cd24

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