Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49b625ac85b74ae…

MALICIOUS

PDF

62.0 KB Created: 2020-11-06 21:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad86028b6f04b94e0355c60dcf46d123 SHA-1: 9ee1fdbe8623951d9e66954422834df44ede704b SHA-256: f49b625ac85b74aeb63df0ebc4c9b83426e6a20dc482fc7ef03ac55cd159abe9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a heuristic firing for a link farm, indicating it is designed to redirect users to numerous other PDF files. The embedded URL and document body text suggest a lure related to 'Ragnarok classic leveling guide' to encourage clicks. While no scripts were explicitly extracted, the PDF structure and the presence of external links point towards a malicious intent to distribute or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://traffnew.ru/123?keyword=ragnarok+classic+leveling+guide
    • https://gupugeja.weebly.com/uploads/1/3/4/2/134235999/83d2f702799.pdf
    • https://xaruxetadelu.weebly.com/uploads/1/3/4/4/134478950/bilaxigederadev-tesodu-bafone.pdf
    • https://rafulosuzeme.weebly.com/uploads/1/3/4/2/134234553/riwane.pdf
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/xexeguj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f162876e-1092-4ef7-981c-b55e346f12ff/tanagozebozadu.pdf
    • https://s3.amazonaws.com/bitizopovopaso/zizutoxodezuzanegiluj.pdf
    • https://s3.amazonaws.com/zasepo/ford_6.0_egr_delete_pros_cons.pdf
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdf
    • https://lavukiju.files.wordpress.com/2020/11/kesozexinajemikidip.pdf
    • https://masugawab.files.wordpress.com/2020/11/bonafozirofodaxatodixo.pdf
    • https://motulod.files.wordpress.com/2020/11/63640009167.pdf
    • https://s3.amazonaws.com/fujadabez/28861881834.pdf
    • https://tilidefixof.files.wordpress.com/2020/11/data_analytics_made_accessible_2018.pdf
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdf
    • https://s3.amazonaws.com/dojonuta/cataclysm_cooking_guide.pdf
    • https://uploads.strikinglycdn.com/files/5df48489-c7c5-4e31-9d03-555595265afc/wubakomonexixezo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5cb.bin
3d0899f3a94416abb08794ea0df5f436e5b40a9ba76ea303750eddf4c0e64515
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CB 5236 bytes
font_01_sfnt_off0000c7ba.bin
53e8c8ea4511823bbc9b1543728e7c24fef523fd57e68905757f3037b647e27b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BA 10256 bytes