Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e745434b33b5ab4…

MALICIOUS

PDF

58.6 KB Created: 2020-10-16 12:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 63d8918ba6f3fb1d9eca2939a2420e49 SHA-1: ab8cb4f253417ed5811042b16745c9efe8731532 SHA-256: 1e745434b33b5ab49181adfe5b04a868f356a1330d8359d1c76d58c1e17e00c7
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector services, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are also listed in the extracted URLs, reinforcing the malicious intent of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/pify?keyword=insert+current+date+in+sqlite+android In PDF document text
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/sakufobe.pdfIn PDF document text
    • https://takijotirodone.weebly.com/uploads/1/3/1/6/131637658/mefujizileniruvogabo.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/1abcb37d8b44.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/1785002.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/sopakasumut.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/zidebesirolabavo.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/ef51e71f-8a82-4efe-a471-a875b9827559/fudawozikirodezetapew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877c035a-49b4-482c-b15e-32282ff4ec38/8158577432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9febc1a8-5f29-4e8a-922b-562ce6c3e1d9/67903683969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687d0eb8-daf0-4c82-b84f-4bab7a3dd4c5/vewoxaxojunililopiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24af3765-b725-4fcd-be7f-719c3aa5817e/94502060522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f042bb5-bd0b-4f8e-8949-d53da457fc75/kepuvifosuxoxotulirufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c481511-da56-4041-bc52-f696000abf05/14458681237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df70cb1-da88-4c57-ab89-e69bddb8c517/2860135892.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5150/7112/files/37730970107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9359/7601/files/politics_in_space_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2812/7650/files/gofel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6969/0022/files/44693005065.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5031/1076/files/normas_del_buen_hablante_y_oyente.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3124/4195/files/jefavakagibado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/6670/4039/files/guidelines_meaning_in_marathi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9175/8756/files/garmin_nuvi_265w_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3907/1130/files/lesson_review_lesson_4_science_answers_7th_grade.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_off0000a674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA674 4996 bytes
SHA-256: fe28a9f5f0230d66baa23eedc5e7a9bb78c98b8f8d17cff7cac24aa0dd379a28
font_01_sfnt_off0000b76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76C 10888 bytes
SHA-256: a649a761b087984e02e5c1569915f1c81eb9e7571dda7ab970be6dcaf5b6737e

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