Malicious PDF — malware analysis report

Static analysis result for SHA-256 905b5d02b831518c…

MALICIOUS

PDF

48.7 KB Created: 2020-11-09 11:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a299c28fde129110170ef95d6a36471d SHA-1: 7c89c903a14f56c833ba32ed7f2c417107c931f4 SHA-256: 905b5d02b831518cc08486c652b7b70cc90b2f177f05094f27d7587541a9cf0b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://traffmen.ru/aws?keyword=granny+unblocked+games+333'. The document body, though heavily obfuscated, contains references to 'granny unblocked games 333' and the malicious URL, suggesting a lure to a potentially malicious site. 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://traffmen.ru/aws?keyword=granny+unblocked+games+333
    • https://cdn-cms.f-static.net/uploads/4417652/normal_5fa5d727bb78a.pdf
    • https://cdn-cms.f-static.net/uploads/4470532/normal_5fa395ae46eb4.pdf
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f88f9e0e1a22.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rizogawer.files.wordpress.com/2020/11/gutilam.pdf
    • https://uploads.strikinglycdn.com/files/56ff9033-e61a-4d14-88ac-307c6d9f942c/watolivelexogu.pdf
    • https://uploads.strikinglycdn.com/files/911a9297-73d4-4a92-8846-3fef15cca0d6/63110007162.pdf
    • https://mewafibita.files.wordpress.com/2020/11/telugu_boy_names_starting_with_s.pdf
    • https://uploads.strikinglycdn.com/files/00dd37cf-9c48-4d8e-9bb5-dba82fe77925/2007_chevy_silverado_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/f0f6c8cd-8b01-4be5-bea8-32347697a296/93539946301.pdf
    • https://firijidu.files.wordpress.com/2020/11/nijemusejewuwejox.pdf
    • https://uploads.strikinglycdn.com/files/b450e791-883d-491d-a71a-db1b2585169e/mugixazawozowareruralef.pdf
    • https://zikatudaxad.files.wordpress.com/2020/11/90607232484.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_off00007ed5.bin
cc1f445c5e88c114d072b4f1065cdfe36fdae94ab4f59550abffd165215108ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED5 5760 bytes
font_01_sfnt_off0000926b.bin
38311e9026105b1baf14dd94bb0efa12c13d27810a7e8471f0d610d9d95608f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x926B 10460 bytes