Malicious PDF — malware analysis report

Static analysis result for SHA-256 833a130c6ff47717…

MALICIOUS

PDF

34.3 KB Created: 2020-09-28 10:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0745cff5b3c827f5876d91e2c2c81c33 SHA-1: 2dad9325d68729887cc30b652ef597d05db904b4 SHA-256: 833a130c6ff477179630c46f94faa197c0694604cd0226dd65ea163620855dac
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.cc/pify?keyword=surface+area+of+cuboids+bbc+bitesize In PDF document text
    • http://files.pecskatingclub.ca/uploads/1/3/1/8/131857270/549a8c.pdfIn PDF document text
    • http://fivomina.elisetrelegan.com/uploads/1/3/0/7/130776542/0847087ddd61.pdfIn PDF document text
    • http://pifuris.serenitiesnow.com/uploads/1/3/2/3/132303382/sokoz_pixipadasago_dezizoxelad.pdfIn PDF document text
    • http://garez.fairlie.school.nz/uploads/1/3/0/7/130775990/bobarevamazato.pdfIn PDF document text
    • http://files.riponcitybonfire.org/uploads/1/3/0/7/130775529/1839761.pdfIn PDF document text
    • http://files.loosecanonfilms.org/uploads/1/3/1/0/131070483/2ef4a973.pdfIn PDF document text
    • http://files.akamitzi.com/uploads/1/3/1/4/131437454/2035b387727.pdfIn PDF document text
    • http://pebebuxom.nicholasmongiardocooper.com/uploads/1/3/2/6/132681513/pisofa.pdfIn PDF document text
    • http://files.onthemovers.com/uploads/1/3/0/8/130874097/tabikinuvikixik.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/1/0436/9770/1018/files/posie_quand_je_serai_grand.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8600/2838/files/json_lint_formatter_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/20450021704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7345/1670/files/uscis_poverty_guidelines_affidavit_of_support.pdfIn PDF document text
    • https://85561bef-f140-4759-a47b-cef4946104c5.filesusr.com/ugd/529ba0_00c56cc7475a45d990210d6ead6c99e2.pdf?index=trueIn PDF document text
    • https://e286c4e1-0fb8-4a33-a2fd-89ee9d418d30.filesusr.com/ugd/16879a_ada9f757a56540a9aad2d489280ae2e8.pdf?index=trueIn PDF document text
    • https://760ef6ef-4441-44a6-8489-423921ba39b5.filesusr.com/ugd/e2f7e1_b960d2b5802046cb94baf2e17bae47d0.pdf?index=trueIn 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_off00004992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4992 5276 bytes
SHA-256: f94bf7296ff505984af0a81850e2c07fd5be0876d06bb5ddeee99493b8fe54e0
font_01_sfnt_off00005b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8F 9488 bytes
SHA-256: fcad4065e48c5933d869fd750796f0d9ab7afab08671a6a84ea0f6f01b75881d

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