Malicious PDF — malware analysis report

Static analysis result for SHA-256 89555cbbe68a1d52…

MALICIOUS

PDF

40.6 KB Created: 2020-08-14 14:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecfcb8754325e5275998346c50652e00 SHA-1: b73b1843ac0371ef5660be4c56cef575b0f79697 SHA-256: 89555cbbe68a1d52692f06c53b4daf01840070866fe694f90608c0d92d718ca1
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector at ttraff.com. This indicates a link farm strategy designed to obscure the ultimate destination and potentially distribute further malware. The ML classifier strongly supports the malicious nature of this document.

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/pify?keyword=f%25C3%25A4hre+ibiza+formentera+balearia+preise
    • http://files.aquadrolab.com/uploads/1/3/0/9/130969300/josapesekag_navasagupuzeli_samijexe.pdf
    • http://girasap.skincrediblellc.com/uploads/1/3/1/0/131069839/xuvijireko.pdf
    • http://jukofuxu.augustineproject.org/uploads/1/3/1/4/131437375/vujedodi.pdf
    • http://widafalut.okawaracollegeconsulting.com/uploads/1/3/1/4/131453858/pazanadijewa.pdf
    • http://files.hhslmc.com/uploads/1/3/1/4/131482886/3b9f53.pdf
    • https://cdn.shopify.com/s/files/1/0438/6154/1014/files/2465816919.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/jewebazirabitegewalenite.pdf
    • https://cdn.shopify.com/s/files/1/0454/4974/0438/files/bacterias_coliformes.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0796/files/27885211706.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/49389329152.pdf
    • https://cdn.shopify.com/s/files/1/0431/0201/1548/files/lavixobutapubadikika.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/force_quit_bluetooth_mac.pdf
    • https://cdn.shopify.com/s/files/1/0452/0670/0183/files/tedalalelogilesalakolidun.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/dawedavatajad.pdf
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/tri_fold_template_for_google_docs.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_off00005d99.bin
9281517103b384a583f2584984cc7ba187ddb8db259067ecc2e78e24ecef8754
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D99 5520 bytes
font_01_sfnt_off00006fb8.bin
aa9696a95ecd3f3b7778a5c0d8b961d4f0b9655f2a39e17bd356d512dd8f4469
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB8 11004 bytes