Malicious PDF — malware analysis report

Static analysis result for SHA-256 682c30f166bfb018…

MALICIOUS

PDF

47.4 KB Created: 2020-10-26 15:12:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 406353006bbdc2eea6e3558313740057 SHA-1: b6f961b67a5c69dcbf9dd88bcf04f6dc725ae350 SHA-256: 682c30f166bfb018ad0860bbe6c4cf0392db033bcdc7b77a56c8b2a7cf3c7d9d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'english synonyms for ielts pdf' and references to the wkhtmltopdf tool, suggesting a lure to external content. The presence of a malicious redirector and a large number of external links indicates an attempt to drive traffic to potentially harmful sites, possibly for phishing or malware distribution.

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://cctraff.ru/aws?keyword=english+synonyms+for+ielts+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5f8e46ff8f195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_5f930c750fe61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379970/normal_5f9114c66a225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f8d02331feed.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/ruwonazawapowib.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/4fdee7971.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/kejudufejirazo.pdfIn PDF document text
    • https://tenimevu.weebly.com/uploads/1/3/4/3/134315692/203732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_5f9338283e72d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f894eead7d21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f892a475c8e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f92ce1c847f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f90a62f6be86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407756/normal_5f92f528c0e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f87557e137dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5f8b6e485c599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5f87ccda24969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5f96592d7e909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/56fcb6da-79ef-49c6-9d29-351fd1bd0355/39040855053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84d30c6-a9cb-4e37-b0b4-4e1439ac8fad/93209764574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad945b4-783f-4776-aa60-b7794b8b87a9/85858475762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0c6ffb-bd62-49f4-9bdc-d8a7281d7b3a/padofuragimilo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF1 5092 bytes
SHA-256: afa872bd6d93c846808f2eab690dfd139ab24143c82660170005e59973167f25
font_01_sfnt_off0000811a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x811A 9684 bytes
SHA-256: 9d8b8a5ba1797bb1dc5cd0a7dce5bf2d76706a02df3036fd676097a6d793f73f
font_02_sfnt_off0000a1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1A8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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