Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8733ff8ee34ab0…

MALICIOUS

PDF

38.9 KB Created: 2020-08-11 15:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ced7c078bd7ba93dee0a23ac42410aa SHA-1: bd2220be9c3b16ba4f2a459ad18d441404af4322 SHA-256: 5c8733ff8ee34ab0edd21e447719308c05707d32dd008d5b76fa33344ef9aa6e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a link farm designed to appear as a free online PDF to Word converter. The primary malicious URL identified is https://ttraff.com/wb?keyword=transformar%20un%20pdf%20a%20word%20gratis%20online. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attack, likely initiated via a spearphishing attachment.

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.com/wb?keyword=transformar%20un%20pdf%20a%20word%20gratis%20online
    • http://files.cooksbeachresort.com/uploads/1/3/1/4/131406558/243159.pdf
    • http://files.chestnutcenter.org/uploads/1/3/0/7/130740256/fuforo-ralixugunusodi.pdf
    • http://bitefak.starkhowell.com/uploads/1/3/1/4/131410685/c83953.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7131/5876/files/zinc_plating_process_flow.pdf
    • https://cdn.shopify.com/s/files/1/0443/5856/6044/files/dress_code_policy_for_employees.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34680977850.pdf
    • https://cdn.shopify.com/s/files/1/0435/6076/3555/files/vomusavowumelenogunawepub.pdf
    • https://cdn.shopify.com/s/files/1/0446/9604/3674/files/buku_akuntansi_keuangan_menengah_1_kieso.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/oxford_dictionary_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4680/files/watabuvibivaned.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/85423188570.pdf
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/ielts_writing_practice_material.pdf
    • https://cdn.shopify.com/s/files/1/0431/7406/8390/files/41329460132.pdf
    • https://cdn.shopify.com/s/files/1/0434/5298/9605/files/simasofufanativifa.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/examples_of_teaching_approaches.pdf
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/88501200075.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c45.bin
ef5932fdb4da9ac2f7f7428eb392fb39de77bebbedb364e3fc2133736d7cb00a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C45 5284 bytes
font_01_sfnt_off00005e33.bin
f6bab883c695406a5e6cdc65c1fba972be65babf2974d6df9f5adaac4227e311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E33 10492 bytes
font_02_sfnt_off000080c5.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C5 4324 bytes

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