Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c0c8c143c6a162…

MALICIOUS

PDF

42.6 KB Created: 2020-10-27 03:17:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 191ea346bb4c3053bd361ea365bbc03e SHA-1: 2694caf8f3e7b890bb782f448c1b56aff9711ce9 SHA-256: a2c0c8c143c6a16207325083b69d48de3fa06aef1a199f3abc625b032555da9f
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, forming a link farm, with one specific URL identified as a known malicious redirector. The document body contains obfuscated text and a URL that appears to be part of the link farm. While no scripts were explicitly extracted, the presence of numerous links to external PDFs and a malicious redirector suggests an attempt to lead the user to malicious content, likely 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://ggtraff.ru/123?keyword=bersa+thunder+380+parts In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f88bb3356e38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402717/normal_5f94686e0ffae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5f976d5648320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5f87f7b2452ae.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/83ec9d0.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/2651895.pdfIn PDF document text
    • https://jelopujepifo.weebly.com/uploads/1/3/4/3/134341958/nuvuzoxojiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxadol/convert_base64_image_to_javascript.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/trigeminal_neuralgia_patient_handout.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/xupufuzukujegiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/economist_intelligence_unit_democracy_index_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f8f7b4-4f5c-4142-a739-fbdbe82f1632/osage_county_jail_roster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2afb117-51e7-4c15-a0c2-ad68cac90984/98598588186.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/3_digit_addition_word_problems_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/wulawefomuvur.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/12116604254.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/caaspp_practice_test_4th_grade.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_off000064fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FB 5564 bytes
SHA-256: cc04f413579bf3956339eb19d8f379e8f5780be5ba90f5f4224911e62c2e9893
font_01_sfnt_off000077d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D7 11048 bytes
SHA-256: 8384b515b91adf64caba5d99def22f88c32a40dfc5b955128d8c49cb3f8f036e

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