Malicious PDF — malware analysis report

Static analysis result for SHA-256 3573c081afe45581…

MALICIOUS

PDF

31.3 KB Created: 2020-11-02 20:17:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 288cd30b81c2d05803f4a2cbc9184a3b SHA-1: 8ef712fd880c17fbe6c7d23b754cc0a3b78ae533 SHA-256: 3573c081afe4558198b717149fea391c62107d315f058e1c6b4318c0cf01de23
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a link farm, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a manual. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to a network of malicious or SEO-optimized PDF documents.

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://ttraff.link/123?keyword=manitowoc+ice+machine+manual+b400 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5f8d4651525f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5f9d8c253d1a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_5f97e53631afd.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/166373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5f94eeb78aada.pdfIn PDF document text
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/linasulokogofipuwaza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_5f9d81798d45e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f879fc31002e.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/1/0497/8183/3882/files/atlanta_to_panama_city_flight_time.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/comment_apprendre_l_anglais_tout_seul.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/gakejisefabukefojodu.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_off00003fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FDF 5232 bytes
SHA-256: 7ba2baf71b2acf106d61df84be1b55c524bc41192b70accf892bdfdd5f19eb6f
font_01_sfnt_off000051ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51AC 9084 bytes
SHA-256: a3695a356e2b0b330d3e8a0167df836943f89d8787f5a16d93a82e575cc6584d

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