Malicious PDF — malware analysis report

Static analysis result for SHA-256 87685b4a14bde630…

MALICIOUS

PDF

47.0 KB Created: 2020-08-24 07:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87ee703ae275427511ae033d2da0acc3 SHA-1: 89643cb4e64bd3d2101ff81e6ff15e149485d86b SHA-256: 87685b4a14bde63093de0037f926283984d3520b3cef45f655354f0887e546f9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body contains obfuscated text and URLs, suggesting an attempt to disguise malicious content and potentially lead users to 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://ttraff.ru/pify?keyword=absceso+periodontal+tratamiento+pdf
    • http://mobox.wlcbands.com/uploads/1/3/1/4/131438641/vuxejuzu.pdf
    • http://begago.eespip.eu/uploads/1/3/0/7/130775934/274540.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5013/1878/files/70122708451.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50537202024.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/64147670692.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0436/0408/2851/files/60352371624.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/57608714443.pdf
    • https://cdn.shopify.com/s/files/1/0430/4424/1562/files/vyapari_mitra_gst_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/0841/8211/files/oceanography_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2471/files/kujenesitonegusawojewup.pdf
    • https://cdn.shopify.com/s/files/1/0432/0064/3236/files/48918396306.pdf
    • https://cdn.shopify.com/s/files/1/0440/4979/3174/files/product_key_for_delta_force.pdf
    • https://cdn.shopify.com/s/files/1/0451/1278/7109/files/case_study_operations_research.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_off00007597.bin
8fbad2c07b99b28c635ec73bc71e1ee2d3772b2bfc3abd3011c912e924f8b6a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7597 5432 bytes
font_01_sfnt_off000087e4.bin
36f32286d612c0bc1e973c659bbff340aec2eb75e9f108c2dcd756923b23f550
pdf-font-stream PDF embedded font (sfnt) at offset 0x87E4 11676 bytes