Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f82e069da5e9e2…

MALICIOUS

PDF

40.6 KB Created: 2020-10-30 03:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 94e185065f597622c6c213f27878473b SHA-1: e8dd875e1f01db7ab689024c85e811ec0b641d59 SHA-256: a4f82e069da5e9e256933f5b786068771a3988bf650ae2b683dd085f4b1bd752
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is 'https://ggtraff.ru/strik?keyword=ecology+worksheet+answers', which is flagged as malicious. The document's structure and the presence of numerous links suggest an attempt to create a link farm for SEO manipulation or to distribute malicious content, likely delivered via spearphishing.

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/strik?keyword=ecology+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5f902c6bdf005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f98065b30998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412891/normal_5f950a576550f.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/2732c288-4603-4332-ab65-386c8cd1b16e/bupilikokawadonovixoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1fb4ca8-e2fe-474a-b688-d3b3bd92cccc/67028454959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5701bf0-eaaf-4f4e-990e-f5c2bf22a246/18270197407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e991526d-9411-4083-a809-8e4c5f610648/mcdougal_littell_algebra_2_and_trigonometry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce795b15-e0ef-4320-997a-e7b4db33de61/zoxup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/6948/0600/files/givexepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/5977/1061/files/yugandhar_marathi_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18c971b-268a-47be-a017-fa1cdc5ca6ce/xorawerekovi.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/daihatsu_sirion_parts_catalogue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61065c0d-0715-4c22-bdbe-c87fca326d9b/dixolelopowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebf4950-b040-4db7-9d91-0de49fcb3c5b/33553895829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2e5495-8d07-4e21-a3c3-9a6e4107a743/61871543738.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/matekofuw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4760 5276 bytes
SHA-256: 0f577a84263edeeae498099b69a2bed587fe5aeabae37bacc087ed7bc6018e88
font_01_sfnt_off0000596a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x596A 9664 bytes
SHA-256: f9aba584598381c7f25c313c8ef026c302f3cb4f21bb535e05dc9742969fe582
font_02_sfnt_off00007a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0A 18012 bytes
SHA-256: 3be98c280d144312910d0f0da556ea34d5af0483eb74d7dc368ba46b54ca2e0b

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