Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ef01f0c7ec33a5…

MALICIOUS

PDF

43.3 KB Created: 2020-10-18 05:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: e34d839c69fe3982c6914a1fc25d6738 SHA-1: 36d2225688f79aefb698df47de821be4232e3dd8 SHA-256: d5ef01f0c7ec33a561216d63f4570385ba4d01caf2b4d0f2eec3c49e5f6802b6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The document body, though heavily obfuscated, contains a URL that appears to be part of a SEO spam campaign. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to drive traffic to potentially harmful sites.

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=crop+image+android+java In PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/mezevoxinokimuwamibu.pdfIn PDF document text
    • https://gamupizesusaza.weebly.com/uploads/1/3/1/3/131398140/wuzave.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/29ca61ee3bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f8740d149eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f8756e6ca801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f8b2a98a42d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5f895cd020189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f8786f2a8109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f86f417256d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f882b197e60a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f8757563e397.pdfIn PDF document text
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/9700181.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/majurarilorafub_poxetedosola_befit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7431/2110/files/free_convert_to_mobi_kindle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1373/7117/files/lagelomumemimo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3897/3345/files/ritenozuwozedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2673/3982/files/47195110137.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/mogavabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5957/1609/files/pokikerevulumezarerikiku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4948/3939/files/83607970577.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_off00006aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA2 5108 bytes
SHA-256: 1b146138d54f9456195f5123754f8960f27a1329f12d316f54f295df982a08ce
font_01_sfnt_off00007bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF5 10468 bytes
SHA-256: fb5dc15694bab8ef23d2d54630e87c9316a31b47aabb9b5f26c71f8f9c30f90a

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