Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb471c1dbbc53aa…

MALICIOUS

PDF

49.2 KB Created: 2020-08-27 14:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 849b1b94a85b6ca7555c91cb23e9e619 SHA-1: 23b0207c62c26e0844559bd0973e354f016b98c3 SHA-256: 0fb471c1dbbc53aa41406c25d3238a9c656f685f1cfb85d28a54581da417609c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed to manipulate search engine results. One prominent URL, 'https://ttraff.ru/pify?keyword=fotos+gay+desnuda+gratis', is flagged as malicious and is also present in the document body, suggesting a lure to adult content to drive traffic to malicious infrastructure. 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.ru/pify?keyword=fotos+gay+desnuda+gratis
    • http://files.geeklectica.com/uploads/1/3/0/9/130969192/rewuzobelova.pdf
    • http://zilezoze.investwithsmdc.com/uploads/1/3/2/8/132814956/zutuzifixi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/limitations_of_cardinal_utility_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0447/3811/7781/files/iso_9001_internal_audit_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/boy_by_roald_dahl.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0197/files/naturisirigot.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/editable_autopsy_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/fubilijimibakevewa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9504/6811/files/13652762230.pdf
    • https://cdn.shopify.com/s/files/1/0430/0541/1481/files/daderefirujubupirure.pdf
    • https://cdn.shopify.com/s/files/1/0428/3816/3623/files/11211550194.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1606/files/57278438643.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/lean_six_sigma_yellow_belt_exam_answers.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068f5.bin
9a061dc160cc05468d7ec0a2de219ac43f68347c542eef5da9258cf86ec39c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F5 5020 bytes
font_01_sfnt_off00007a19.bin
df31964c0d6700da39a18d3f0d1af1bdf7f5360004dab05315967eb11ed6187f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A19 12300 bytes
font_02_sfnt_off0000a1bd.bin
9e1271d681207e96fe60c94df920a27091a957dc81e2614e9e6235263a34fce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1BD 16068 bytes

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