Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9cd0c3b8c0b09e…

MALICIOUS

PDF

43.3 KB Created: 2020-07-09 23:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1371ea44cdd199a7c2de04ca604a65f8 SHA-1: a4abb0ccfa86182d0a434a1580872fc0ff28b866 SHA-256: ce9cd0c3b8c0b09e92f576220438ef38907bfb5bfe68de7f1483f6cbedaa6e51
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. The primary link, 'https://ttraff.ru/wb?keyword=el%20neoliberalismo%20libros%20pdf', is identified as a malicious redirector. The document's content and structure suggest a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. No scripts were extracted from this sample.

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/wb?keyword=el%20neoliberalismo%20libros%20pdf
    • http://files.emirhrnjic.com/uploads/1/3/0/8/130813531/1218481.pdf
    • http://files.bradleyestates.co.uk/uploads/1/3/2/6/132682570/wirifobeje.pdf
    • http://files.atmltharris.com/uploads/1/3/1/6/131636737/db8772bee.pdf
    • http://files.eguastella.com/uploads/1/3/1/8/131871690/4656610.pdf
    • http://files.unwindhealing.com/uploads/1/3/1/4/131407629/botilajaxagamulalaf.pdf
    • http://files.davidthornecri.me/uploads/1/3/0/7/130738806/kopekapokaxize-niketolatini-tugegosaxa-powamesezusifak.pdf
    • http://files.collegeidcamps.net/uploads/1/3/2/7/132712514/lunibab.pdf
    • http://files.onyxfuneralplanning.com/uploads/1/3/1/3/131380413/pofadajigivep.pdf
    • http://files.yunkawasiperu.org/uploads/1/3/1/3/131379612/vizarifogumawov.pdf
    • http://files.talico.com/uploads/1/3/1/3/131379774/bf9852a2bc.pdf
    • https://buzuboxovova.files.wordpress.com/2020/06/31126387533.pdf
    • https://reginefu.files.wordpress.com/2020/06/gamebalokiwidowipitifit.pdf
    • https://tuvelajago.files.wordpress.com/2020/06/85193323039.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xutuxajaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dipudakafadaned.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67572949107.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067bf.bin
38be268b85c420a7a32f3032792cab61f5132a8140a74bb26cd1750cb4b00b6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x67BF 4992 bytes
font_01_sfnt_off00007882.bin
3b7ab5f717245afa579ee1d3c0ea993ca87f4fb24cf2780fafba9e9b955c2e49
pdf-font-stream PDF embedded font (sfnt) at offset 0x7882 11796 bytes