Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e9f8b8062b459c…

MALICIOUS

PDF

45.4 KB Created: 2020-10-28 19:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c2ffb4aa73cdc17100dcba916d3d6db8 SHA-1: 3b4c0e1d9c2e96d0bf988ae46fd3394e78328f78 SHA-256: 33e9f8b8062b459cdd46090d4526ceccebf2778311379dd545d06c992989a448
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure and link farms, indicating a phishing or SEO poisoning attempt. The primary malicious URL identified is https://cctraff.ru/strik?keyword=how+to+make+a+paper+longer, which likely leads to further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

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://cctraff.ru/strik?keyword=how+to+make+a+paper+longer In PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/2122197.pdfIn PDF document text
    • https://fiwisiroveton.weebly.com/uploads/1/3/4/3/134339953/valesopakufivulutamo.pdfIn PDF document text
    • https://gedokepapivit.weebly.com/uploads/1/3/4/4/134464903/fefavutiw-dovomenibarewa-zidegoliwaku.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/3603842.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/2f1b23.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/8737190.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/jejovevup.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/4dfe47e7.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8276696.pdfIn PDF document text
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/7293483.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/mujevubutukoxu/73915317678.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/destination_b1_grammar_and_vocabulary_with_keys_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/clinical_psychology_research_topics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3427/4723/files/76377002584.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9462/0333/files/81775836848.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0470/9029/files/43190933870.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0613/8787/files/vorlage_sepa_lastschriftmandat.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/31456401668.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_off000073b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B2 5080 bytes
SHA-256: 9079d377401c872d89dec85318aa821688ef6c624c3b0644223bdd11dfa59da9
font_01_sfnt_off000084f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F2 10452 bytes
SHA-256: 792dd491242389c73ac65d9b6d92d4f36895db2d93211f0bb880a65ea75fa980

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