Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e05ea4b2aa70d0…

MALICIOUS

PDF

35.8 KB Created: 2020-11-02 20:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd3897615e7b489c771075479a86c91a SHA-1: dc3455811499264245a42848bdccb6c6c7cf5a9b SHA-256: a2e05ea4b2aa70d028e0cd832311fd4a1abab1a479e01784bc2af5afd4473d7a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector heuristic. The ML classifier also strongly indicated maliciousness. The presence of many external links suggests an attempt to direct users to potentially malicious or SEO-farmed content.

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=waukesha+engine+manual
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5f8eab5723519.pdf
    • https://wuzafonufiza.weebly.com/uploads/1/3/4/3/134341979/5904943.pdf
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/xulisege_pewakagiwunixaf_xuposubofakor_wosanuve.pdf
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/3125712.pdf
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5f9aee4b91777.pdf
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/66da07d82ab21.pdf
    • https://resumasilazivo.weebly.com/uploads/1/3/4/5/134509929/wawokeduguz_vupexezep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0498/1702/6715/files/51493527560.pdf
    • https://uploads.strikinglycdn.com/files/fdb83d87-b452-44ba-bcfc-69609c1c5a7e/mogupil.pdf
    • https://cdn.shopify.com/s/files/1/0497/5791/3247/files/62774453697.pdf
    • https://uploads.strikinglycdn.com/files/87390712-29cd-4373-bd7f-7f171f7fb489/furulekazebaxonopim.pdf
    • https://s3.amazonaws.com/ruletetunima/24071634106.pdf
    • https://cdn.shopify.com/s/files/1/0500/6698/1027/files/marmot_clothing_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0503/4849/0915/files/busuzosekivexuz.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_off00004dfb.bin
b2fd7a4ff27d8188716c08f4221b206bc2cc44658901453bf95a83566cc39c70
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DFB 5080 bytes
font_01_sfnt_off00005f32.bin
c85763cd27599676e0dd97741028e1f3ab54e05212c12336f6c82ae98cdda6cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F32 10364 bytes