Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9647af09c6b010b…

MALICIOUS

PDF

33.1 KB Created: 2020-10-31 09:21:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3b79268e08cab14d67cf3c8283a38025 SHA-1: 1ed0b95b49dc10fe6c32ab776393944778b780aa SHA-256: c9647af09c6b010b0c7b46a34d6676b9b7d0097d14bb4705523e5552fd36428c
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on disposable domains, a technique often used for SEO manipulation or to distribute malicious content. One of the embedded URLs, https://cctraff.ru/aws?keyword=ooze+twist+slim+pen+amazon, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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/aws?keyword=ooze+twist+slim+pen+amazon In PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/8808719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367627/normal_5f8e6d1ab8675.pdfIn PDF document text
    • https://mobuzuwatajol.weebly.com/uploads/1/3/4/3/134310732/6191100.pdfIn PDF document text
    • https://rifelejoxew.weebly.com/uploads/1/3/4/3/134330737/dojigenexiwumok.pdfIn PDF document text
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/mukejuvuxureked.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/40b2b46bc.pdfIn PDF document text
    • https://febukorev.weebly.com/uploads/1/3/4/3/134325382/davuribi_vezaxudaduwe_mobujib.pdfIn PDF document text
    • https://lutenidu.weebly.com/uploads/1/3/4/3/134398581/4d52a3953be.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/velowo_dakemolaku.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/1/0497/7783/6183/files/laminar_air_flow_operating_room.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_off000044c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44C1 5036 bytes
SHA-256: 84dbc0a2c0158316cc17c0f6ee061e78e3cf49017eb561fb936c3fcde9594209
font_01_sfnt_off000055e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55E5 9940 bytes
SHA-256: 23e3791bea9afc32542233d1a538d378c8d8493ad4c6a8daeec172610744470d

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