Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aadd35bb2e34012…

MALICIOUS

PDF

35.6 KB Created: 2020-10-09 16:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b2f2881907dc1152e34cfd9d2693f942 SHA-1: 692b08d9f2c812aeea71ec9d023374af91486fb0 SHA-256: 7aadd35bb2e34012091396ca7797c7ba87616cbbf522d801486c01759b37f5a8
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged a payment redirection lure. The document body, though heavily obfuscated, contains the URL https://cctraff.ru/strik?keyword=what+does+ext+mean+in+email, suggesting the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=what+does+ext+mean+in+email In PDF document text
    • http://zakob.victoriabmua.com/uploads/1/3/2/8/132814930/e451edfb63.pdfIn PDF document text
    • http://files.banginhardfireworks.com/uploads/1/3/1/3/131381679/522ad4.pdfIn PDF document text
    • http://files.collingsandcompany.com/uploads/1/3/1/3/131384166/semaba.pdfIn PDF document text
    • http://xugin.edithshope.org/uploads/1/3/1/3/131379409/guxabopozefe-bexopenujir-xijip.pdfIn PDF document text
    • http://files.gabrielfadale.com/uploads/1/3/1/3/131380000/zosusit-mewenureketowi-dejifavumifa.pdfIn PDF document text
    • http://janozul.hosseinradmard.com/uploads/1/3/0/8/130873872/xigakagunoferod.pdfIn PDF document text
    • http://zifoke.herbesque.com/uploads/1/3/0/7/130739615/6499481.pdfIn PDF document text
    • http://lamef.cakemediahq.com.au/uploads/1/3/1/8/131871781/588d3a7383bff8.pdfIn PDF document text
    • http://files.dajkgroup.com/uploads/1/3/1/3/131380871/toxedubujamafepo.pdfIn PDF document text
    • http://sowoji.nationaldebtmgmt.com/uploads/1/3/1/4/131453674/mefavufena_kuvomujuluniba_pakusu_mubuxewapav.pdfIn PDF document text
    • http://files.tasteingainesville.com/uploads/1/3/1/4/131452944/7255931.pdfIn PDF document text
    • http://files.everything-365.com/uploads/1/3/2/7/132710589/fosofemafapu.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/1/0440/6041/0021/files/1844441049.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2406/3392/files/ascend_d10_kayak_amazon.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_off00004d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D18 5048 bytes
SHA-256: 2d294b6b195112910c3fae13df7dc52aa1c053e46f134566508789dbf0c763ac
font_01_sfnt_off00005e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2F 10464 bytes
SHA-256: 63f7a6e51151c271a5320b0a8d2100b302db9af1199108b190acd66bc424fb06

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