Malicious PDF — malware analysis report

Static analysis result for SHA-256 26842a4ba29311a9…

MALICIOUS

PDF

46.2 KB Created: 2020-11-05 09:22:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd47453486fb168fd28fe3f99e1e25b6 SHA-1: 1c3f14624f51a27d6c04d5e544ffa34b2b418aa3 SHA-256: 26842a4ba29311a9c77c268a7db3058848c92fbc9d3575f38eb600cd8b112fe1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The document body, though obfuscated, contains references to 'Minecraft theme song' and the malicious URL, suggesting a lure to drive traffic to malicious sites. The ML classifier also strongly indicated 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://gettraff.ru/123?keyword=minecraft+theme+song+on+piano+easy
    • https://cdn-cms.f-static.net/uploads/4404515/normal_5fa2666181392.pdf
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5f9bd3f7ea1c0.pdf
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5f8c6918d8cf1.pdf
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f873cac0286f.pdf
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f945a0ad6e73.pdf
    • https://cdn-cms.f-static.net/uploads/4412377/normal_5f9dc975c75ee.pdf
    • https://venifamu.weebly.com/uploads/1/3/4/5/134501621/6625055.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tetazino/zonomurexedaligifagide.pdf
    • https://s3.amazonaws.com/tizowodifi/cement_manufacturing_process_file.pdf
    • https://uploads.strikinglycdn.com/files/bb42c4e8-91fe-404c-be81-a13fbca8aa48/xufopekegamiwobiza.pdf
    • https://s3.amazonaws.com/gumegulaxi/rulunawebafuduzajusa.pdf
    • https://uploads.strikinglycdn.com/files/d079e297-6454-4da2-9646-db5fb1b7622c/xasivaxeraki.pdf
    • https://s3.amazonaws.com/gozilum/vomarip.pdf
    • https://s3.amazonaws.com/sugaguxagu/analysis_and_design_of_algorithms_by_udit_agarwal.pdf
    • https://s3.amazonaws.com/jolufozo/yard_machine_rear_tine_tiller_parts_diagram.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_off0000734f.bin
3ec291d8724a8b3519678e6bd4139a2d0edfce9565c9e580e200c6d9bedc6bbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x734F 5504 bytes
font_01_sfnt_off000085f6.bin
6b688755d4f887f8808400cfb9be3a0f555278447647236a675313c0d4cbe568
pdf-font-stream PDF embedded font (sfnt) at offset 0x85F6 11240 bytes