Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31d92722d3265d0…

MALICIOUS

PDF

34.9 KB Created: 2021-06-25 14:39:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d4581cfc98815a7040e0d69e9afe40dc SHA-1: 5b859e19ee40f3e3b99c726b22082431f3925da9 SHA-256: e31d92722d3265d021b427634d1e63ccffc9b976423d5565cb1756378b25c974
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and redirectors. The document body and extracted URLs suggest a lure for downloading game cheats, hacks, or in-game currency, which is a common tactic for distributing malware or unwanted software. The ML classifier strongly indicated maliciousness, and the presence of a redirector link further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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 http://netcdn.co/app/431946152/cheat-engine-1.6-roblox-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-generator-no-ads-or-surveys_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-jailbreak-hacks-2021-may_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/couleur-de-peau-free-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-your-self-getting-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-human-verification-site-wwwjeuxvideocom_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-redeem-toy-codes-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/fiverr-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/talk-as-someone-roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-minecraft-java-edition-for-free_GM479516143.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
font_00_sfnt_off00003184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3184 22184 bytes
SHA-256: f6b26fc64b141f34ab95f36b0d58830632a486ac6e6ce88b2595f2292fe6118f
font_01_sfnt_off000062bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BD 19216 bytes
SHA-256: 072fc37935f4092b186adf0318668c16114fa7cde5b4e2d08bbfe742672b2824

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