Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d81273f86e6c39…

MALICIOUS

PDF

41.5 KB Created: 2020-10-30 00:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 99546893fc425b470b865b78c325dcb2 SHA-1: 2e2f7e9961674b15aa473e46cae8c88fff24e49f SHA-256: c1d81273f86e6c39c7cf388f220ed3e5cdfa504da5d3b9489445e4fb91ce922f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection scheme.

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://ggtraff.ru/strik?keyword=96+jeep+cherokee+fuse+diagram In PDF document text
    • https://jirixakevafu.weebly.com/uploads/1/3/4/4/134404576/b2414367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390328/normal_5f9aca40b7490.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/2107864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f956baf255ca.pdfIn PDF document text
    • https://norajinojo.weebly.com/uploads/1/3/4/3/134381333/vumubovalufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f86fedf353e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_5f8c564e37c63.pdfIn PDF document text
    • https://fawubanine.weebly.com/uploads/1/3/4/3/134321827/2033019.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/6026554.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/875312d0-9a20-4088-8a10-88e3f8db2ff3/sony_bravia_850d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c931a3d-573b-4b63-aaa3-1f6d7028581f/27948511809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14ba99c-cba3-411c-98b4-f94d36d6c332/73288407448.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_off0000635d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635D 5892 bytes
SHA-256: 80475148add1001ff533f89778dc2ff37323e4069262c878a00e43a1cc6d4929
font_01_sfnt_off00007740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7740 9860 bytes
SHA-256: a9459f86643e86f4a15a070295e9f098624dfec285da5d3c243edc3e22c51356

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