Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a9980d55542c3f…

MALICIOUS

PDF

44.2 KB Created: 2020-09-05 08:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 35a13cc55930971b900ea9a061ece614 SHA-1: 68517d6f56423e1ddb35152abe9d67b0933e821f SHA-256: e3a9980d55542c3f8bd30f9a90fcfe986bebfab27ff4dd5dd521ec2e8ca8b6e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to drive traffic to potentially malicious sites. The ML classifier also strongly indicated maliciousness.

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://ttraff.link/pify?keyword=battle+of+bosworth+newspaper+report+ks3 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/3aca14_5613137570e94d28ab89486edfe64b83.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/20d83a_0acb34243ff44c67b13f500295c3f0df.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/963627_47600c598ebc4b268f81ae5e487fc28d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ba2c19_2cfe88ca0fb24e399002a9e229585864.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/efb3f0_a658e117ce1b4fa6a1c76a1f7419455e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bc0b97_ff92940f7f52423991954a8158bcc5d0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f46427_16756bde17ed48c788ebffbc6c1e82a2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a2d007_8ab85c245f474c6c9f26ad8a531c3b52.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3080/6679/files/67618693863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0509/9675/files/33656717379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6508/9941/files/43080437223.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/42290649147.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4135/6967/files/harkins_theater_job_application.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/9954/3702/files/appsc_group_2_prelims_previous_year_question_papers_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/google_chrome_developer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4355/2412/files/92684754960.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_off00006f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F07 5496 bytes
SHA-256: 88c2545bd86145839d9a0ff6744525dc4a71106971787a0ee3d83d92bf7443b9
font_01_sfnt_off000081c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C5 9936 bytes
SHA-256: 6e4c309812649dc009f7c8ae470838b89629155732ced00d97f7bb0a64e19a95

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