Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa5fcc022128ac1…

MALICIOUS

PDF

43.5 KB Created: 2020-10-27 20:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 64e686dac7d9ca87151c3aa5d4280ff7 SHA-1: 26d400498c834efa6e6f5ae604e8fab465fb2a98 SHA-256: 6aa5fcc022128ac12cc930f158059efc8097fcca6a6e3fb03664733ae75b99d8
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to a known malicious redirector. The document body and heuristics indicate a lure for free downloads, likely leading to a phishing or malware distribution site. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=westcrest+park+seattle In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f87a8f26e43e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5f8bafb3429c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f8acb961908c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f8f2dfd5eb72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5f8d17326a4db.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/felasorarabipis/adverbs_modifying_adjectives_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/asciidoctor-_footer_image.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/wuvonorefitipeleroram.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/23082077637.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/la_jeune_millionnaire.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/52714728113.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/multiple_choice_answer_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/hr_audit_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/richard_bandler_john_grinder.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/pdf_to_word_editable_converter_free_download_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6794/8706/files/71387507759.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0298/5621/files/boosie_net_worth.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1742/4024/files/apk_stickman_legends_shadow_wars_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7901/8912/files/horry_county_arrest_warrants.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/nadejefijivu.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/aluminium_alloys_lm_series.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_off00006b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B88 5004 bytes
SHA-256: f8542331869fa822daf2957915dafe7b3a5fe2d12196fa4d5964d99e7f519c08
font_01_sfnt_off00007ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA6 10916 bytes
SHA-256: a8fcd393f530255f8ee315821db780ec78f3ab2d4e30441df180702ab3e47285