Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a81e9afb6f58f0…

MALICIOUS

PDF

59.4 KB Created: 2020-10-04 02:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c8ee343104deab9869f7019fdb99973d SHA-1: 95288f820c415ceb49a48819a860ba963a265166 SHA-256: 73a81e9afb6f58f0a501a3805239cb47226d12fbf9ead8c9cb51e043c0c9311d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a significant number pointing to external resources, characteristic of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document's primary purpose is to direct users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=velozes+e+furiosos+2 In PDF document text
    • http://jidowete.indigenouspoliticalauthority.org/uploads/1/3/2/6/132683085/wojunilape.pdfIn PDF document text
    • http://files.wyndancegoldens.com/uploads/1/3/2/6/132681479/xozefuz.pdfIn PDF document text
    • http://files.evanobranovic.com/uploads/1/3/0/7/130776478/relupugat.pdfIn PDF document text
    • http://niwomofa.mtzpbc.org/uploads/1/3/2/7/132740214/1842270.pdfIn PDF document text
    • http://padozire.tillstowasser.net/uploads/1/3/0/8/130874153/a93c4b56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0929/7560/files/97878084912.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/a_raisin_in_the_sun_book_cover.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/8874/1282/files/where_can_i_buy_kerosene_at_the_pump_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f2a4526-abe6-4bd6-aea8-815305d8bf6d/jedavojexoxujew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e329b264-7502-45e5-841e-877c1ea89b62/45919625347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5c9c0e-11b4-4ec9-abcf-69b863fc62d8/gibisel.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_off0000a726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA726 4700 bytes
SHA-256: 5f3e434cab124413846a1f2e8b64f29f1fd300160c524a90fd7a62e25491cb04
font_01_sfnt_off0000b73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73F 13340 bytes
SHA-256: 266ac9375047358256b5b3288ebe31b94241b101402835432052fea1471d468e

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