Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8df064c8525918a…

MALICIOUS

PDF

43.2 KB Created: 2020-09-19 18:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8c0682af042e71d5ee0677a61392a730 SHA-1: 681c60e537220eee084c6f4c765a2c286dc50312 SHA-256: a8df064c8525918ace173fda4fc480a80a0cb2bfcaf35f168b931a122eb3427f
224 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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://ttraff.com/wix?keyword=nova+epigenetics+worksheet+answers In PDF document text
    • http://tewewoga.cactuscompression.com/uploads/1/3/2/8/132815176/6278594.pdfIn PDF document text
    • http://xuxigipuz.michelangelomilano.com/uploads/1/3/0/7/130740597/00f16af146de15.pdfIn PDF document text
    • http://popixe.soilandsun.co.uk/uploads/1/3/2/3/132303320/6088485.pdfIn PDF document text
    • http://lupaguno.mrsobriensdistancelearningliteracylink.com/uploads/1/3/1/0/131070718/zavorato_palebe_boxogurikus_parar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5a66967-f923-48e6-bfb2-d5118cdad63e.filesusr.com/ugd/4cd51e_65e51b70b72b4d5b97b1bb42feefe86c.pdf?index=trueIn PDF document text
    • https://feea21d9-5639-4fe5-92fc-dc4dcad7199d.filesusr.com/ugd/5ed537_47081e89792143cfae95c8fd2cb079b9.pdf?index=trueIn PDF document text
    • https://78413500-aa22-4425-94e7-405ef164e1e1.filesusr.com/ugd/764aaa_3c4a72bbe350434487a78de281b686b0.pdf?index=trueIn PDF document text
    • https://75787e3a-3b7e-467a-bc43-5a2771c38f40.filesusr.com/ugd/3283b0_82c110cc39264a73a029ab5d1f8b85a3.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/toluwenir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9581/8397/files/kinds_of_adjectives_worksheets_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7056/9113/files/cinderella_man_questions_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8571/6886/files/73615322007.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/mugufowukosoxexap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7519/9391/files/51346589664.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_off00006a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1F 5348 bytes
SHA-256: 37db3a2716782e0ed806133eb54ec25de56b90e0ec506353bc66f59651232ad1
font_01_sfnt_off00007c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6C 10664 bytes
SHA-256: cbb8196b79574aa692365f9b9c9b827910f1db4639ee4828bf9fc939a2e03012

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