Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afe9d9038f8e92c…

MALICIOUS

PDF

82.9 KB Created: 2020-11-04 09:22:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02ffc967706c58b339c50b515fec09b9 SHA-1: 1933576958ffe22b1400955598820689fde6625a SHA-256: 0afe9d9038f8e92caa60d88f7ecd28a3bc0212bb26aba5c69f8d64b3d44a6e79
162 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a link farm, with a critical heuristic firing for malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=the+bee+movie+transcript
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/rebodi.pdf
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5f8b3187bb51c.pdf
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f878991cce3e.pdf
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5f90e89ddc229.pdf
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/9288153.pdf
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5f9d06ba70f25.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mogelebolep/18493017687.pdf
    • https://s3.amazonaws.com/bixumiburi/lakeside_arena_clements_ca.pdf
    • https://s3.amazonaws.com/wilugugo/aptis_test_examples.pdf
    • https://cdn.shopify.com/s/files/1/0268/7608/4411/files/90946109877.pdf
    • https://s3.amazonaws.com/kavitokolezub/familia_sarcophagidae.pdf
    • https://s3.amazonaws.com/genedonapubefe/albert_camus_francais.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_off00010987.bin
05b3bb7f4fd4cbf6816b38b3f98955e5e68ae440e3486b41e22642fce0631003
pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 5288 bytes
font_01_sfnt_off00011b56.bin
ded90bea4e2a89fb1b6cf1db17bc3d8a39711f416e6d54b93b854ce9663dfb14
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 10420 bytes