Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dd33275622fe5d…

MALICIOUS

PDF

42.7 KB Created: 2020-10-02 20:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 55eea0c2cb4877b6b0a44b1584c79e12 SHA-1: 6d45ff2e918d64f1a19cf6cac4deba4fd231df11 SHA-256: 99dd33275622fe5d163c6a06914009f6b478d9265f5df7fdb98c74cb07182255
162 Risk Score

Malware Insights

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

The sample is a PDF document containing numerous embedded links, many of which point to SEO-optimized PDF link farms and a known malicious redirector. The ML classifier strongly indicated maliciousness. The presence of a visual download button lure further supports the malicious intent. The document body contains a URL that appears to be the primary malicious redirector.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=cnc+freze+rad%25C3%25BCs+yapma In PDF document text
    • http://xetojet.dawnmader.com/uploads/1/3/0/7/130740558/zivonudeze.pdfIn PDF document text
    • http://files.shadowwolf-studios.com/uploads/1/3/0/8/130873828/dokafetaxudama_razodis_zepotirem.pdfIn PDF document text
    • http://goduvon.droughtdesigns.com/uploads/1/3/1/0/131070805/nasomum.pdfIn PDF document text
    • http://runakuwe.reversac-traductions.com/uploads/1/3/1/3/131379732/bifeso-zaxekonu.pdfIn PDF document text
    • http://www.2elmakina.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d333d3-b53b-4873-8e63-40cf4b6be54d/pikomotasisad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c5cbca5-d576-4e58-b1af-012ab50b2d32/10649804380.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5663/5804/files/bsa_safety_merit_badge_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2960/4763/files/lizegubupujemosejuwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6289/3471/files/kodedefuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/85378637842.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4517/5971/files/93647051047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0c7f68-8b89-420b-95c4-184b9477db2e/59456649267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5624563-45c8-4247-95d9-489f55719f0e/27017650627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4da62b7-3e7c-4a98-97e3-3d6561eafb9b/xaxaxizuzadosiwagokaseb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/108203c1-82f3-48fa-92b4-8a3b61b07457/77232609298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0648c60c-a6b7-4dff-879a-5fc0dc79b728/wamanod.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000651e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651E 5448 bytes
SHA-256: b44ebe21966ce81238e3e507b46191105f607ae4f0c049299840c3c4c4f699f7
font_01_sfnt_off0000776d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x776D 11744 bytes
SHA-256: 122aece08f0cddf271f3392a47097686e04c17e2cda47fb5385987cc9449d321

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