Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f5cb1eb815221a…

MALICIOUS

PDF

60.9 KB Created: 2020-10-07 01:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 59aa3ec4810fd5b57e711dee29073407 SHA-1: 3abe0a93a7b195f85793141b990afe321590a908 SHA-256: 81f5cb1eb815221a487ded493c9742090aaa5f4c035219c4fe258b04eb80f50d
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a redirector for 'notability paper templates'. The ML classifier strongly indicated maliciousness, and the document body, though heavily obfuscated, contains a URL pointing to a known malicious redirector. No scripts were extracted, but the presence of malicious links suggests an attempt to lead the user to a compromised site.

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://ggtraff.ru/strik?keyword=notability+paper+templates In PDF document text
    • http://timoki.drpetermessmore.com/uploads/1/3/1/3/131384436/2861762.pdfIn PDF document text
    • http://losow.perrymaxwellsociety.com/uploads/1/3/2/6/132681579/lurugeb.pdfIn PDF document text
    • http://files.100womenwhocareannapolis.com/uploads/1/3/0/7/130739379/zudojewupidez.pdfIn PDF document text
    • https://site-1039427.mozfiles.com/files/1039427/35855442788.pdfIn PDF document text
    • https://site-1037098.mozfiles.com/files/1037098/tubunoxabexoxereribiweziz.pdfIn PDF document text
    • https://site-1042598.mozfiles.com/files/1042598/1288308959.pdfIn PDF document text
    • https://site-1038489.mozfiles.com/files/1038489/91391929113.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/a89e514b-1649-4bcf-8960-4ab0d50c8ee4/20877280091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a365b764-0e66-4e7a-ba71-98398eefb7b2/12106342302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f0fcdc-6d49-4301-a427-9cf25970649a/8553343268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d75901-a25f-43a7-8e57-ebd22a73b6b9/4867927009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/244b2004-a6f5-4528-81b9-de1ef5aa1ec5/serapaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93aebc3c-52d3-436e-a03a-8b64c6d8055f/31402070882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1061ce-8a6a-4590-be5d-656dc24454de/daruxebosobowizikul.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_off0000b317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB317 5176 bytes
SHA-256: dabbd24ae29502eb2377ac0b66e11b2c71b79eebcec40a0fe35bce5ecf7df1d2
font_01_sfnt_off0000c4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A0 9992 bytes
SHA-256: 0778455691abeaca8b0ac7975244b1b58da02ea48d45c213fd0f850fa7c3dd7c

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