Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0408806b8fda3c9…

MALICIOUS

PDF

41.5 KB Created: 2020-10-08 20:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4d3874fb7ce786992491b30d9746695e SHA-1: 66e7839d575d6ff40ce45b2d6f13c8e14020b258 SHA-256: b0408806b8fda3c902f882b63ed0e6cb517d4047832903f95240790cacd7d8c0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, with several heuristics indicating malicious redirector infrastructure and a link farm. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the URLs, suggesting an intent to drive traffic to potentially harmful sites.

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=all+excel+formulas+with+examples+pdf In PDF document text
    • http://files.jonoheyes.com/uploads/1/3/1/3/131379042/bakajumefuj.pdfIn PDF document text
    • http://files.kinsellamitchell.com/uploads/1/3/0/7/130775241/2388334.pdfIn PDF document text
    • http://files.crystalbluefeatherart.com/uploads/1/3/1/3/131379351/5605167.pdfIn PDF document text
    • http://pigew.menengagedelhi.net/uploads/1/3/2/7/132710795/7802034.pdfIn PDF document text
    • http://files.cakesfromthelakes.com/uploads/1/3/1/8/131856815/zusujesiza-xiwisoz-judipijulow.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/1/0432/9229/5333/files/plastic_drain_snake_broke_in_tub_drain.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2564/5224/files/98691177078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49677ac-9adc-492b-9131-20988f5a672f/77867362143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bafe6b7b-ce73-4359-92b5-3c791835e28f/49937425630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f358a4-6188-4876-906c-eda894c09b21/sodabunadixikamesakivimi.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_off000062f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F9 5544 bytes
SHA-256: f60e4b48e966ed918b1894e0f53b41116b6bdd6b19a351cd99a2a3ff7b012360
font_01_sfnt_off000075bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75BC 10456 bytes
SHA-256: 539e0ea9babf7f6a0b82da830d3654395f52b986f4c8c6ac2d888383693b31e4