Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a79e9d53ddcdfc…

MALICIOUS

PDF

57.6 KB Created: 2020-08-08 15:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ecf7618c2e548f9f194aeb00d215b35 SHA-1: 69e1afda5e3cc7d9a862f053cda4055ce492e432 SHA-256: 76a79e9d53ddcdfc50681e4ad81afd8742366a27b0bdb133af4e7107f97d3d9d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying one as a known malicious redirector. The ML classifier also flagged the PDF as malicious with high confidence. The presence of a link farm suggests an attempt to distribute or redirect users to malicious content, likely through a phishing or scam lure.

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=basarab+nicolescu+pdf
    • http://saroxuno.well-healed.com/uploads/1/3/2/6/132696212/5548582.pdf
    • http://files.increaseus.com/uploads/1/3/0/7/130774970/wesusesugare.pdf
    • http://files.besttestboosters.com/uploads/1/3/1/6/131606289/lilaxi_misoj_womodamuraw_nabix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/28396951303.pdf
    • https://cdn.shopify.com/s/files/1/0434/2048/3751/files/20460910017.pdf
    • https://cdn.shopify.com/s/files/1/0434/8733/0464/files/45341908004.pdf
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/pipewisukuguturivusefip.pdf
    • https://cdn.shopify.com/s/files/1/0439/9867/5102/files/astrophysical_jets.pdf
    • https://cdn.shopify.com/s/files/1/0434/5144/9496/files/gosetunanivonilaju.pdf
    • https://cdn.shopify.com/s/files/1/0432/1358/6596/files/valivejopovoxojogamefu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4495/4527/files/rowebukepepidaxoxujapu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/55066422387.pdf
    • https://cdn.shopify.com/s/files/1/0435/5309/5844/files/fusalonekan.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7134/files/saxawefadunineva.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/nujigevutolinad.pdf
    • https://cdn.shopify.com/s/files/1/0435/8596/2142/files/chiang_mai_old_city_map.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_off0000a277.bin
1ddfaf503afefd4b1a5fb0c0cb02ab95a5fcfa62468637432b4c9e33903807dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xA277 5336 bytes
font_01_sfnt_off0000b4a7.bin
73b7f719132f5b8dcf79d22e01d5b526a8c787d54d12785df5403f3ca96141cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A7 10996 bytes