Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e646d797146548…

MALICIOUS

PDF

44.9 KB Created: 2020-10-15 07:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2b7221473f7836ca1e2f425ab39aff90 SHA-1: 76568212a26319f653fc6b30c014b3e242b8dae7 SHA-256: c1e646d7971465486f2f92e5adf698a5018b7fbbd8092ec4d82fcfbd556043fb
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, also contains URLs that are likely part of a link farm designed to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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/123?keyword=que+es+materia+organica+del+suelo+pdf In PDF document text
    • https://site-1041608.mozfiles.com/files/1041608/dulatobogal.pdfIn PDF document text
    • https://site-1039361.mozfiles.com/files/1039361/71321941460.pdfIn PDF document text
    • https://site-1039954.mozfiles.com/files/1039954/jubemimafesefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f8708ced05e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_5f8784696f1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f87a6a1aca89.pdfIn PDF document text
    • https://site-1040528.mozfiles.com/files/1040528/mugeka.pdfIn PDF document text
    • https://site-1042625.mozfiles.com/files/1042625/25870142512.pdfIn PDF document text
    • https://site-1039210.mozfiles.com/files/1039210/werituranuv.pdfIn PDF document text
    • https://site-1039893.mozfiles.com/files/1039893/898163654.pdfIn PDF document text
    • https://site-1037844.mozfiles.com/files/1037844/23835541258.pdfIn PDF document text
    • https://site-1042549.mozfiles.com/files/1042549/57770103475.pdfIn PDF document text
    • https://site-1040426.mozfiles.com/files/1040426/36565147242.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/1/0432/8017/1174/files/certificate_of_good_moral_character_ust.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9612/2561/files/krispy_kreme_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6434d929-7c2b-4cea-a7c2-d44d0f11bdb5/fitutufogelibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/785a8601-f398-446e-9758-abee87ce034a/jaresogorumuvilevawadazez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89129577-a4ab-4a46-abc5-f1272715da8a/padujetapezeruno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd626f0-9d8f-4cf6-9b72-e4ea744f5807/kasazizijela.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_off00006b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B45 5536 bytes
SHA-256: 26d7fe23e018d63feee86c541f397ed46094481f1f21a724a5ff7f5731df8c43
font_01_sfnt_off00007dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFE 11912 bytes
SHA-256: f50a8dc2da3bcf1950acca763ec40d5c61d580173e9693712df7319bd22a116e

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