Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86378694d7478c1…

MALICIOUS

PDF

39.7 KB Created: 2020-10-01 04:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f5ae81841f53ea14d082627a7f7e8021 SHA-1: eb6d7ba3209b3029c5d8982e12d3c10899f58aed SHA-256: b86378694d7478c17548f98fad76b6573baad6c86f1b26a5759a8b8d51d0d16d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector URL known to host malicious content. The document body, though heavily obfuscated, contains the primary malicious URL. This suggests a phishing or scam attempt designed to redirect users to malicious infrastructure.

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://gettraff.ru/strik?keyword=agriculture+durable+pdf In PDF document text
    • http://files.questioningdevelopment2016.com/uploads/1/3/1/1/131164297/safekidudetofu.pdfIn PDF document text
    • http://files.mingdersch.org/uploads/1/3/1/0/131070178/8cd5338.pdfIn PDF document text
    • http://files.thesoundhealing.com/uploads/1/3/0/7/130738794/cc29a.pdfIn PDF document text
    • http://jifipo.enhancedance.com/uploads/1/3/1/3/131384709/9340163.pdfIn PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/42248996955.pdfIn PDF document text
    • https://site-1036821.mozfiles.com/files/1036821/tikepu.pdfIn PDF document text
    • https://site-1036830.mozfiles.com/files/1036830/nasawuzip.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/1/0430/9080/4893/files/fugikajiwotefome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4869/2633/files/parque_de_las_ciencias_granada_horario.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3318/8762/files/carbene_reaction_mechanism.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2413/7890/files/zumuvinemadotowefuluk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0939/0238/files/beaconhills_college_pakenham_uniform_shop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b2ef40-89bb-4a41-bfc4-7f10dbe5586d/kopujofezize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/275d94f7-2671-45e0-9c4d-80b1d12a62c8/figasabejejanos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc47468d-dd39-4914-99ef-f3059eebe6cf/14358467159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369c22f4-e1af-472e-baaa-fe853d3386f0/11299535665.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_off00005d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8F 5272 bytes
SHA-256: e7283d8ba5e5e7353a6fcc1e485c7bfeb764c973aae855a13953999cc6673f40
font_01_sfnt_off00006f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8D 10268 bytes
SHA-256: 8b31a13086ace61a0e3ce2beff483cb1d666d2d85a2ede75da60c1c3aa0ba63a

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