Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bc1bb4199b3d89…

MALICIOUS

PDF

96.0 KB Created: 2020-12-23 12:22:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3c098c006ad65a13299be8dc68acf87d SHA-1: 2522c2d48855424f655346da6f29b1af0cbfebe9 SHA-256: 53bc1bb4199b3d8905e323ce916496a9ddbfdcd4d61d20c02a86215512623a2e
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 large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body text appears to be garbled, but the presence of the 'Modern warfare 2020 release date' string suggests a lure. The embedded links are likely intended to lead users to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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?utm_term=modern+warfare+2020+release+date In PDF document text
    • https://basipavegisu.weebly.com/uploads/1/3/4/3/134390368/zuzibozabobefukofiw.pdfIn PDF document text
    • https://vukibawurop.weebly.com/uploads/1/3/4/6/134601902/puvobuxazevux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f87525c2853e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483586/normal_5fca7be23b731.pdfIn PDF document text
    • https://wovegusokab.weebly.com/uploads/1/3/4/8/134850220/257b8817c8c8.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/c9edcc3a-f3bc-4003-b3ff-f65a0734bb6c/tupesivalosopeluxisaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66e10fa-a78a-40c7-a288-0713fe634b46/biology_exam_paper_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f88eb3-a147-4ed8-9af0-42c90591ed33/another_word_for_dislike_very_much.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba25789-65a1-428f-867c-7ca2674c3235/blood_sugar_118_in_the_morning.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/8728205434.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_off00013686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 5272 bytes
SHA-256: 343354c507dca64c8954aa9a2effcb8f1c71829592b039a1c582a5074158e987
font_01_sfnt_off0001489f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489F 13356 bytes
SHA-256: f109fb510827fce40f52bd555131fedce63c4fa0e48fe2b842de8ea5f13bd440

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