Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf04ab36d8b2637…

MALICIOUS

PDF

45.2 KB Created: 2020-11-02 12:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fd73c76dbf650917058261540b43ff2 SHA-1: 559391465121092b0a9ff7c0dd2ebc0783d34099 SHA-256: acf04ab36d8b26377cedfa0aebc854509cfb55b45e1d2da29ea82f06f6ccca34
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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/123?keyword=icnc+2020+nuclear
    • https://cdn-cms.f-static.net/uploads/4382962/normal_5f986db4ccd4d.pdf
    • https://cdn-cms.f-static.net/uploads/4369775/normal_5f8fce07c2640.pdf
    • https://jugefisofewutep.weebly.com/uploads/1/3/4/3/134368120/madalemolajigut.pdf
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/midadoronodefezevel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/susopuzupure/tepuxijunipadesororepijel.pdf
    • https://s3.amazonaws.com/sugowubuf/algebra_1_eoc_practice_test_2018.pdf
    • https://s3.amazonaws.com/xunilukegez/handley_high_school_winchester_va.pdf
    • https://s3.amazonaws.com/zirojopemup/caste_certificate_form_in_hindi.pdf
    • https://s3.amazonaws.com/peveziwoguxuzam/mofawovedisararabesaje.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073e1.bin
df90b11f8ebf53ade4817b04e67d0241d00a723e8e2dbd45f080899e797b7194		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E1 4828 bytes
font_01_sfnt_off00008457.bin
a0f33a54d6c61501e152d6f6b79ed0eb335c23f9453e4d6374cd982190a85780		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8457 10632 bytes

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