Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab4bd92ffdecb8e…

MALICIOUS

PDF

34.5 KB Created: 2020-10-02 01:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7f602bc03099847b5ff07d924b072335 SHA-1: ee996c68c0afe267f81cb911cd09f6d6a2aea42b SHA-256: bab4bd92ffdecb8e860c26a5e49f9802cc0e573520d2edd6274f53a660734627
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. Another critical heuristic indicates a PDF link farm, suggesting SEO manipulation or a large-scale distribution effort. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs and link farm structure point to a malicious redirection or phishing attempt.

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://ggtraff.ru/strik?keyword=perdida+por+secado+farmacopea In PDF document text
    • https://site-1038499.mozfiles.com/files/1038499/naketipido.pdfIn PDF document text
    • https://site-1036775.mozfiles.com/files/1036775/mesozamelo.pdfIn PDF document text
    • https://site-1040200.mozfiles.com/files/1040200/zemupojepimesibejekabem.pdfIn PDF document text
    • http://sudatuba.codeofbehaviour.com/uploads/1/3/0/7/130739347/nevus.pdfIn PDF document text
    • http://vajow.carnivaltourskochi.com/uploads/1/3/1/3/131384552/lifubewir-waravasi-zolose.pdfIn PDF document text
    • http://jepedu.felicityj.com/uploads/1/3/0/8/130874376/245161ebd9b273.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/1/0484/2477/9933/files/padulunawo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3404/9703/files/reglamento_de_construccion_ciudad_juarez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3867/3562/files/pop_rock_and_soul_reader_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2135/5173/files/77780324519.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/history_of_human_population_growth_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3862/9275/files/tuwepudanij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9171/4982/files/pubopo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7811/4727/files/lolow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5849/1303/files/pitusiluzijudenewiwen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/manny_khoshbin_book.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_off00004a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A1D 5272 bytes
SHA-256: 8b8685d1a40baebbb842500d8fb2c976f25f80ad0175a09421e048ba6170e5ad
font_01_sfnt_off00005bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF5 9740 bytes
SHA-256: 98ac259709324b0ceb2446e2b9322a40e3f01882a106bdee20c85d2b807ff8f3

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