Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef65db8ee16952cf…

MALICIOUS

PDF

51.2 KB Created: 2020-10-25 06:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 44303f7a1267a5883f3e6fd5f79d5808 SHA-1: 38563eaae75dbd32da0b89f22cb1157ec0237180 SHA-256: ef65db8ee16952cf2dce69ca67bc287888e77de556e10ec8384460f319ae93ce
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 heuristic firing indicating it links to known malicious redirector infrastructure, specifically pointing to 'https://gettraff.ru/strik?keyword=broly+movie+free+online'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external content. The presence of numerous other PDF links further supports the link farm heuristic, indicating a likely attempt to drive traffic to malicious sites.

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://gettraff.ru/strik?keyword=broly+movie+free+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5f898776211af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f870a8922d02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5f8acb677623b.pdfIn PDF document text
    • https://wumunelopilum.weebly.com/uploads/1/3/4/3/134395902/nefedefepepifugo.pdfIn PDF document text
    • https://pigofularujatuf.weebly.com/uploads/1/3/4/3/134360020/9898281.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/972b312d1f0.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/748572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_5f8e24402969f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5f8b689740a4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f94aa919d38e.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/601f03fe-136e-4747-856c-366fe1785d10/passive_voice_grammar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716ee9e9-11c9-451d-980d-fd2c6cd5ac2f/77608512385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c936a10-d054-4d33-8ab5-d475e43a6492/98540630149.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5940/7765/files/89588496235.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6163/5991/files/goblin_leader_5e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1809/9094/files/72430658341.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4833/7049/files/independent_or_paired_t_test.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_off00008a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0A 4736 bytes
SHA-256: d49dd7382b494f0382d01f098bd9ca693e2739e83f62f77d7d2c68f538f64212
font_01_sfnt_off00009a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A21 11076 bytes
SHA-256: 74adb6af7c8818b6dc3dd4e91d5d4ba2c4b3d83e2d3a36b8b03b94a114ecdc8f

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