Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ed8b7e80bba9df…

MALICIOUS

PDF

62.0 KB Created: 2020-10-19 17:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68a217d543c79d755a20c1cc306cdca5 SHA-1: 9d7d1938b2b8587cce3a974dac896be95b94a470 SHA-256: 48ed8b7e80bba9dfe3961b48ef91fa8a1bbb4804d7ca95f3fd016d48f2c370d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link is designed to lead users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, suggesting an attempt to manipulate search engine results or distribute content through a large number of sites. The ML classifier strongly indicates maliciousness.

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://ttraff.link/123?keyword=arabisches+alphabet+tabelle+pdf
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8be1bb62f1c.pdf
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f8c0a132dfea.pdf
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f87085499587.pdf
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f871adc64e54.pdf
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5f88b1272401f.pdf
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5f8ce0575a7fa.pdf
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5f89310de921c.pdf
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f872079388a7.pdf
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f8878ac8516d.pdf
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f87d6300a21a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0459/8733/2253/files/31252717709.pdf
    • https://cdn.shopify.com/s/files/1/0478/2329/0527/files/hotstar_premium_mod_apk_download_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0500/5964/1025/files/56530751013.pdf
    • https://uploads.strikinglycdn.com/files/e337e6a1-8b92-4b80-999c-42010d3d71f7/fonuwebafetoladeru.pdf
    • https://uploads.strikinglycdn.com/files/3c44fe39-12d0-41fb-b04a-25c2d0beebee/funevadoxasarikokota.pdf
    • https://uploads.strikinglycdn.com/files/66c988e8-0ad0-4b69-95f2-473dc38dddce/96345008816.pdf
    • https://uploads.strikinglycdn.com/files/7fb3316a-c7fc-4b47-b92e-18d276c6736c/respuestas_del_libro_de_espaol_2_grado.pdf
    • https://uploads.strikinglycdn.com/files/478bea44-f785-41f9-8e6e-87eaa4ecd8de/duwivemolefabuzibe.pdf
    • https://uploads.strikinglycdn.com/files/610ba0a1-1c9b-44e8-a0ff-d33a2ef6c339/vedemararidazusepediwifuf.pdf
    • https://uploads.strikinglycdn.com/files/3148ce70-9427-45a9-83bb-f8f3e9bc9d2f/juselinelulanevunax.pdf
    • https://uploads.strikinglycdn.com/files/ff6142f0-0dd0-4a44-ae0e-ed25470a636a/xolevigabejekagesoj.pdf
    • https://uploads.strikinglycdn.com/files/ed203aac-95ea-4f45-aa80-ebe78e21ea35/40280846347.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000c164.bin
49e7f4cc50bc8e5c500868127cd9f821db08950ae4cde2fe3d810432a694d803		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC164 23072 bytes
font_00_sfnt_off00007d85.bin
5f9c58e33cfc9f1bbd7087e98b6fa01773f839c44d76fa0010f0268b036e75b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D85 5372 bytes
font_01_sfnt_off00008fbb.bin
7604758adedf16f22148134b271d849dba629635cd2423cabaffddf376f5d062		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBB 16300 bytes

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