Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df9aced6782cdb2…

MALICIOUS

PDF

38.8 KB Created: 2020-10-28 15:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 178bc9371a2bdbc0324f2185dbb87b9f SHA-1: 181b607ba11d4a25527906c0725a457111ff9369 SHA-256: 4df9aced6782cdb2a3675d6dd8a2fe3ac4c4a40273b1fb230213d0436e5759ff
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though partially corrupted, contains text suggesting it is masquerading as medical information to lure victims. The presence of a large number of external PDF links indicates a link farm or SEO poisoning attempt, likely to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://ggtraff.ru/strik?keyword=merck+manual+of+medical+information
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5f88690404935.pdf
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f9239435c8dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tetazino/jobusakelatosawevino.pdf
    • https://s3.amazonaws.com/zetare/24808654087.pdf
    • https://cdn.shopify.com/s/files/1/0487/0432/3734/files/corona_tree_pruner_replacement_head_assembly.pdf
    • https://cdn.shopify.com/s/files/1/0502/8193/9144/files/maths_questions_gcse.pdf
    • https://s3.amazonaws.com/vazisi/atmega2560_microcontroller.pdf
    • https://uploads.strikinglycdn.com/files/6b477c43-7023-412b-8ca9-e47b1ed4d8b3/lagev.pdf
    • https://s3.amazonaws.com/gavexilatuvitaz/datixinebigopupifebotap.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/bleach_final_chapter_anime.pdf
    • https://s3.amazonaws.com/wapabefizosumi/fijat.pdf
    • https://s3.amazonaws.com/wonoti/33370838320.pdf
    • https://s3.amazonaws.com/nawuvud/cellulitis_idsa.pdf
    • https://s3.amazonaws.com/vatakefojunib/vunesu.pdf
    • https://uploads.strikinglycdn.com/files/f21e4bfd-5701-4dae-b4a8-5d980c491ea2/68547619553.pdf
    • https://s3.amazonaws.com/jofunozuzof/72532299066.pdf
    • https://s3.amazonaws.com/megodipewukitoj/luvupabewusafaxubofuvik.pdf
    • https://s3.amazonaws.com/davubewu/spinal_fusion_exercises.pdf
    • https://s3.amazonaws.com/viboxikuz/jivigifo.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_off00005864.bin
da3223913e372d158499ed988b27763e6766839275586a4f357d2776189125bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5864 5060 bytes
font_01_sfnt_off00006992.bin
1de0122d3d6dfa3c6d2f4387de4e972579fe9eb0a7c81691381bd7a6965abf85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6992 10740 bytes

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