Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf15b82358d33ce…

MALICIOUS

PDF

38.3 KB Created: 2020-11-05 13:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 691a4366f63b0a0b2fb4f155c1e8b34e SHA-1: b6b8901136c4f7a61c19985909527592275e4079 SHA-256: dbf15b82358d33ce5e2c7c630ef24b106d2bc698fff6037d067f8ce86abde294
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, including one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to direct users to malicious sites, potentially for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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/123?keyword=butternut+candy+bar+recipe In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5f8fa703c24a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_5fa32f2528225.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/lujunekexeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_5f8c71ae48001.pdfIn PDF document text
    • https://jojawetoterul.weebly.com/uploads/1/3/4/4/134404105/najunosapubirafufago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_5f8e9b8facf17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f8f71db6c60e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f8703b72f56c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f883c1daad4f.pdfIn PDF document text
    • https://pesulomerusetus.weebly.com/uploads/1/3/4/1/134109359/6815789.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/8367589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f8c4d4fd6552.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/74047600061.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_off00005559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5559 5148 bytes
SHA-256: 41f2507c7cc9ed5874d4317ccf551e522119001bb25437dbb6a792154bbd14e9
font_01_sfnt_off000066ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EE 11164 bytes
SHA-256: a24acf5aa3a7224c37bf24a915a03b6ea61b13efabb342c310c9ccf3ef3620b9

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