Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87f437b2b66e54b…

MALICIOUS

PDF

45.4 KB Created: 2020-10-14 20:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c01b4514ad7ff9ccbeb1ff3080f78b41 SHA-1: f7e02b5ac41ff4e768fef217fa908c5ae76c19b7 SHA-256: c87f437b2b66e54be7b9f428f1792353aa4b2cab471a0895489ea30a991c7579
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lead users to malicious 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=themen+aktuell+1+arbeitsbuch+pdf+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D0%25B1%25D0%25B5%25D1%2581%25D0%25BF%25D0%25BB%25D0%25B0%25D1%2582%25D0%25BD%25D0%25BE In PDF document text
    • https://site-1038608.mozfiles.com/files/1038608/36688503202.pdfIn PDF document text
    • https://site-1041491.mozfiles.com/files/1041491/16834040522.pdfIn PDF document text
    • https://site-1038753.mozfiles.com/files/1038753/tezeza.pdfIn PDF document text
    • https://site-1048528.mozfiles.com/files/1048528/31377530486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f872c1ad9633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f8709a652e13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f87065c73620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f86fc1ac8798.pdfIn PDF document text
    • https://site-1039861.mozfiles.com/files/1039861/jizakevinagavafobexowok.pdfIn PDF document text
    • https://site-1039341.mozfiles.com/files/1039341/57651470727.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/ef5730c2-7c08-4862-b463-4faaaf0a94ab/44943628784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d54415c-0229-4fa9-873e-2ad33c148564/wosufewupidige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d53ef5f5-8f00-4123-8821-3be04c287c24/sevoxelilirawefegisoput.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3366/4922/files/fairy_tail_romeo_and_wendy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9828/0604/files/pebanageri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0491/3558/files/6551262210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/16400387029.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/2780/7646/files/dosukexevovazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480b1995-2644-4d14-a7eb-b6cf300c3b04/getikafeporelode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5081a8b5-ca5b-4e7f-9e9a-23a61f731c6e/15343929519.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_off000060a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A4 6828 bytes
SHA-256: c1cbe1e91f402e06475fa810a6397158943eba4f771f4df74ac64716dfad256e
font_01_sfnt_off0000762f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x762F 15132 bytes
SHA-256: 4f4c3b94e2899301222defa446d75084ae7ffc7f651b21dd0933ec037aaa85fc

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