Malicious PDF — malware analysis report

Static analysis result for SHA-256 788d7916203e16f0…

MALICIOUS

PDF

32.2 KB Created: 2020-08-24 09:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 979abc054dd5552af07de2fd5b643453 SHA-1: 371a6adf492fdcc29634b3d6b62b0df25dd1421f SHA-256: 788d7916203e16f0b029ef0fdb9513eee6bbf32248fa0f8bd406ff5c2e29bf2b
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged the document as malicious. While no scripts were extracted, the presence of a malicious redirector and the link farm pattern strongly suggest an attempt to lure users to malicious content or for SEO abuse.

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=horn+blow+song++pagalworld+mp4
    • http://files.michelleayurveda.com/uploads/1/3/1/3/131379639/955876b5228.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/busuwagaxudi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0981/8272/files/58981187695.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81236671698.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/9925161665.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8642/files/mawanapu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0258/5500/files/matplot_bar_sort_by_values.pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/79120839917.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3169/files/95004936081.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/complete_business_plan_for_bakery.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/scert_full_form_in_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0440/4995/7029/files/78676287745.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6517/files/math_worksheets_for_grade_5_exponents.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_off000041dc.bin
675a9f0488f44c596f3a2f359686e05c9fa9aca845ecf610d04b8b27320d7690
pdf-font-stream PDF embedded font (sfnt) at offset 0x41DC 5560 bytes
font_01_sfnt_off000054b3.bin
f27c0577dd5a7906d93c03f627ac9f9ec6ae0cef8c13f0c692c251236638cd88
pdf-font-stream PDF embedded font (sfnt) at offset 0x54B3 9284 bytes