Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc0d50ffd66364b…

MALICIOUS

PDF

44.1 KB Created: 2020-10-17 12:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a936cac8568d727b0020563dc725c4ab SHA-1: 728a79ed21f35f46eac464c2196042c812bed09c SHA-256: 8dc0d50ffd66364b329589db39850d14fd0182445e20472b56c76d497f68f854
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to disposable hosting. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik?keyword=o+que+siginifica+saque+dep+-+cod+01. The document body, though heavily obfuscated, contains this same URL and appears to be a lure related to financial transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=o+que+siginifica+saque+dep+-+cod+01 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f890a8068d1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f8976c9386c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5f8a0e163be3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f89fac0b6192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5f88ebc013581.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/rosugebe.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/vazefobizesekewe.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/segaboseze.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/72c776f2c3ce.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/guseded_piret_sibadafomo_kuwok.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/noruweviwenepe-gufujaluxumud.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/zutilipevozafeguwu.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/3946656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f89df1628327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5f8a529942f7c.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/1/0434/9699/7030/files/ladivaxafetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6640/0673/files/45370542608.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4587/7922/files/74167165896.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_off00006ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC6 5572 bytes
SHA-256: 5bf80459d6da0d33ce1d063490f0bb3cd1cd194578edce7910b1483cb294f1bd
font_01_sfnt_off00007dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD5 11480 bytes
SHA-256: 60df41cf97d48e11c69a2fadee232be1ced78be783c3bd169675448ff51741e7

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