Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9359ecc0865fb40…

MALICIOUS

PDF

59.5 KB Created: 2020-10-16 09:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a0c188ac3576de30f22ecb1ed182ce60 SHA-1: 71b7893149b9228c23f33788e3cee0c767afcaae SHA-256: f9359ecc0865fb40efd149b605493b76a8d51a3f53f64c1994000839147af2aa
154 Risk Score

Malware Insights

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

The PDF contains a malicious link that redirects to known malicious infrastructure, disguised as a document about stress relief. The PDF also contains a large number of links to other PDFs, likely for SEO manipulation or to obscure the malicious link. No scripts were extracted, but the presence of a malicious redirector suggests an attempt to deliver a second-stage payload.

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://cctraff.ru/123?keyword=stress+relief+yoga+and+meditation+pdf In PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/ce02014a20d.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jasamejug-jenutuzudemeluf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f890e7969d87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f888ee7519b9.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/1/0497/3962/8703/files/seguxebunufevinetegoriva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2080/1942/files/unbreakable_wooden_man_magic_toy_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/6964/0356/files/sailor_moon_sailors_ranked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9008/6561/files/67979387379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8334/9668/files/algebra_2_function_transformations_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/phantom_comics_in_bengali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9186/8310/files/settlement_agreement_template_singapore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/pepiloju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7016/7966/files/garmin_nuvi_1490_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf321fdb-6414-4c5e-a70a-6cdf6d8758c6/83374738963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b2db4a-5d53-4473-8994-9f17203774bb/9556672133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f194c22-594d-4557-a3a6-312ef7119857/73370032232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea3f8b8-1452-4603-9676-c3108b588e3c/55878292846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee736769-5d79-477e-bfa8-661637d55c7d/5254381115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c382f7ac-023e-4a2e-b479-cc9c2e36ee28/zabofutusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f24c8a06-518f-4846-9b52-9c61c925960a/3831026612.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_off0000a870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA870 5568 bytes
SHA-256: a201a5aeb192b871c924466323207af924f1b5cc981cb39857faa7b755842cf1
font_01_sfnt_off0000bb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB49 10844 bytes
SHA-256: d9c7459ab31578d120840e286393169bf495aa96827e1ef81d718675035247ee

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