Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8a8de9651d63d5…

MALICIOUS

PDF

48.1 KB Created: 2020-11-08 21:28:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d477ec04e2ffecf7e68a7160f1bcea3f SHA-1: 993a603b8d57646311da3e46998ce281383448ba SHA-256: 3a8a8de9651d63d5d94d75155b512658a5e6b38022009c703c5b2481be13a7cd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to redirect the user to phishing or malware distribution sites, masquerading as free ebook resources.

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://traffking.ru/123?keyword=a+child+called+it+free+ebook In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_5f911af992182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_5f95f1f075dac.pdfIn PDF document text
    • https://rexolofozex.weebly.com/uploads/1/3/4/3/134368018/2af627d2499f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_5fa7ab938690b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f8bf9794b7a6.pdfIn PDF document text
    • https://tusejefil.weebly.com/uploads/1/3/4/3/134320171/042349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5f981e0c20719.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/1623963.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pilefetel.files.wordpress.com/2020/11/rise_of_kingdoms_commander_upgrade_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2101d07b-7a97-4446-a796-ec80e6d9376e/nomavupurexe.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/free_car_repair_manuals_chilton.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_off00007e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7C 5124 bytes
SHA-256: 946a84e8132fca2a80aa5bc6de00b0e1f5649829e790b430685e217ead72d7c7
font_01_sfnt_off00008fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE5 10548 bytes
SHA-256: 9d2e8301a6ede7411739db865068c3d3d1415ba6d837eea3cd991900bb864ac8