Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6537bf988b2841…

MALICIOUS

PDF

65.3 KB Created: 2020-08-28 11:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00a3860c6f5697b9bf18d9853836a3be SHA-1: 5b5800d80bc224c72b771a8b7f1a386a21679e7f SHA-256: 0b6537bf988b2841486dd0a677098683244212c4d8f74004420b9be439f8700e
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains the same URL, suggesting it is the primary lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of links to other PDFs, likely for SEO manipulation or to host further malicious content. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of malicious intent.

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.com/pify?keyword=automotive+mechanic+books+pdf+free+d
    • http://nemuwete.oduintervarsity.org/uploads/1/3/1/4/131437914/fobab.pdf
    • http://files.learningandbehavior.org/uploads/1/3/1/4/131409526/juvatizorajame.pdf
    • http://posij.motorcyclestereo.net/uploads/1/3/0/7/130739655/9c21d5.pdf
    • http://kigowoti.johnstonlurecompany.com/uploads/1/3/0/7/130775565/435ba2696e8cf7.pdf
    • http://xuzenup.runninsranch.com/uploads/1/3/1/4/131437626/wikerepoviravabik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/81208560833.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/7782641095.pdf
    • https://cdn.shopify.com/s/files/1/0429/7352/8223/files/14800024513.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8209/files/bienestar_laboral_en_las_organizaciones.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/tigeregoxudavunimafodit.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5919/files/etiology_of_congenital_heart_disease.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/deluzopokipejapuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/79816330678.pdf
    • https://cdn.shopify.com/s/files/1/0430/9424/5537/files/sodium_bicarbonate_sds_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0446/6917/3923/files/fafuvukabon.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b461.bin
2e98c6a9932e1444c9200c6ff0d5ceb3f8a50a15fe4490af448c7b48ce42b6e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB461 5616 bytes
font_01_sfnt_off0000c757.bin
c22d08ad0f356aac0004a7c3e214959f5233e865ac96fea7c48b5c91b7a9f46d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC757 15744 bytes

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