Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbeb619db6a25d3…

MALICIOUS

PDF

60.5 KB Created: 2020-10-27 12:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 79b6222b9fe592899a55633e8efbba9d SHA-1: 36b272246bcc6faf37ab65104f464b2a86aa7a1e SHA-256: 1bbeb619db6a25d32fbf289cc313d1443d300438d7adc894fcc7301700cf9d5f
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to a redirector infrastructure identified as malicious. The document body, though heavily obfuscated, contains a URL that matches the identified redirector. This suggests the PDF is designed to act as a link farm, directing users to malicious sites under the guise of providing free downloads.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/strik?keyword=regard+or+regards In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_5f8a8168d55a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5f8cff5ee88ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8725294d870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_5f96cd602520e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5f8cff8948d7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_5f931a9bb5038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f8742105ce30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f89a46039221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/belarakijazok.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/linaxidabu.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/wufagud.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/47876961769.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4365/9677/files/xikawefafinemaxofaxulal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7115/4592/files/junejomalujisosomidez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/29286278367.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2045/0972/files/fahrenheit_451_part_2_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2544/8091/files/67351026481.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6445/5079/files/5872155026.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C4 6880 bytes
SHA-256: 5780f26d8c6cae6db5e7302fa265b1aff82d215e1c0cb23eab4937eb6fce1c79
font_01_sfnt_off000080bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80BD 4968 bytes
SHA-256: 0acc85fe164b99834c5dbcf87a5bebfc0d57a0a8aaba57663da38a1d94282785
font_02_sfnt_off000091a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91A8 6056 bytes
SHA-256: 2958904a8d9072beae467f68f3799d3910c3ad2703e00ebf81225cb575468138
font_03_sfnt_off0000a15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA15F 13292 bytes
SHA-256: fec551b1f89f3e5d0b10be7271f86cf6ed4dccd961003c0fe1b9d63a6c6c8a4f
font_04_sfnt_off0000c9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AB 17548 bytes
SHA-256: 99e2f4bb1851e0eb5b270c03dc319f27173d9a7f4192d2af6fc383cc586ac2f8