Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ec829986bbd1a8…

MALICIOUS

PDF

50.8 KB Created: 2020-10-27 13:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b8b6c1e9cbd2bbce5a5918b8df71da56 SHA-1: 3e455bf33df949aa0725d7ab76cbfeef6d129d00 SHA-256: 86ec829986bbd1a897cde300694b24a4459e90ed0c2a887523283540099a38ed
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically disguised as a book title. It also exhibits characteristics of a link farm, embedding numerous external PDF links. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the redirector link suggest an attempt to lead the user to a malicious site, likely for further exploitation or phishing.

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://ttraff.link/123?keyword=book+of+proofs+hammack In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5f97904910e53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5f91c56741156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f8a794a3d0ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f8742aec2d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5f8de6d33bb06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f88b16edcb12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5f8a63b5c1caa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_5f8eab04c6187.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/1/0499/2889/6673/files/suspenso_da_exigibilidade_do_dbito_fiscal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7162/6659/files/kefugonilixafufepidajirib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3250/9085/files/nissan_n17_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/5633/3468/files/pennyworth_imdb_parents_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9449/5398/files/stockage_donnes_application_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8950/9017/files/dogamolomurizop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3378/6025/files/164075443.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1938/5502/files/37564233167.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7115/2023/files/finite_dimensional_linear_algebra_gockenbach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad833596-3254-4608-9252-58dde3f81996/belexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89481183-dd0b-4afe-8f6d-b70383440912/repaso_ingles_1_eso_con_soluciones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58fc331d-1dbf-4f4c-b11d-78204ed8a05b/kasudusumusetiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb0e26f1-d2a3-429d-be01-35a1d17fc4e6/saxajiziv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7727/6326/files/dd_charm_person_in_combat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6386/9085/files/finotozi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4155/3046/files/contoh_proposal_penelitian_kualitatif_lengkap.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_off000085f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85F8 5336 bytes
SHA-256: 7b1a0b1a0d3452b23cbccadab56fd799b102e358712943ae32f6fbc12861cee8
font_01_sfnt_off000097fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97FC 11592 bytes
SHA-256: 49c8d7e04e13e1c8be4fe184195cc84dc9d9d0b63debec1551fb0f53183dd1f9

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