Malicious PDF — malware analysis report

Static analysis result for SHA-256 709f1971db94d026…

MALICIOUS

PDF

62.2 KB Created: 2020-11-08 09:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c64a673751bdc3da81044677822ff690 SHA-1: b9e97347cb9cf02640a168e76346bd883fb28a8b SHA-256: 709f1971db94d026c97f7c08bcdaa0ff2443cd121058214758a79f322b5207f8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, with one pointing to a suspicious domain ('trafftec.ru') that is likely part of an SEO poisoning or phishing campaign. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a malicious site, potentially exploiting a client-side vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?keyword=pap+protocol+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380070/normal_5f9147f2cb39c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_5f948b559c9b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f9453fbf3672.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/sozubikemudede_loxexewisivojex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_5f9ec1fcd0b3d.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/sijude_gepifexoxire.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/pizivurapab/maulana_tariq_jameel.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/easiest_way_to_learn_english_grammar.pdfIn PDF document text
    • https://dituxol.files.wordpress.com/2020/11/cochinilla_en_las_hortensias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a761e9-86ab-4583-9a7d-463718e61edc/paired_sales_analysis_time_adjustment.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/chicago_manual_of_style_indexing.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_off0000b25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25A 5076 bytes
SHA-256: 334b44c113646007a45324608dec0791beb9534db34bcc06a573d777fad8184d
font_01_sfnt_off0000c38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38A 12132 bytes
SHA-256: 4861826697a194aa2618a5c072408dc64f9f36a0c7f6623891be832925f45d5d