Malicious PDF — malware analysis report

Static analysis result for SHA-256 6480f8e6177e0747…

MALICIOUS

PDF

41.2 KB Created: 2020-08-19 11:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8512851a79a7acd046579127b02b94cb SHA-1: e73bbea6f9421354619d34d7b597a2386456deb4 SHA-256: 6480f8e6177e0747a92d60da5f091d63efe0ba459107bc476a9b4cc9f2d6ff85
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though largely obfuscated, contains the malicious URL and other links that appear to be part of a link farm. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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.ru/pify?keyword=encyclopedia+of+mathematics%2528+science+encyclopedia+pdf
    • http://xisuvewad.peregrinosysusletras.net/uploads/1/3/1/3/131398405/1ee9b2e.pdf
    • http://tejuxip.edrenzi.com/uploads/1/3/1/8/131857114/kodolabaxizuki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/suvagave.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2864/files/enrique_iglesias_euphoria.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/pexowewaziwamivorure.pdf
    • https://cdn.shopify.com/s/files/1/0433/6294/3144/files/83942838446.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3831/files/german_b1_course_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/99212915871.pdf
    • https://cdn.shopify.com/s/files/1/0430/2903/7219/files/agenda_docente_2020_para_imprimir_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0428/5621/8780/files/tarot_aleister_crowley_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/jquery_ajax_complete_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/0250/2048/files/fesoxopovanigawusux.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/duwuzelotebupapex.pdf
    • https://cdn.shopify.com/s/files/1/0431/8914/1664/files/alter_ego_plus_a2_guide_pdagogique.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006108.bin
4871bf65006c23388d32e16873d1370406f62352026644248d34c80a8ca15da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6108 5436 bytes
font_01_sfnt_off0000736d.bin
9167520a20344d206d445d5cde9257cca2663ea981e39f68e45014c07ef4b310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x736D 10684 bytes

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