Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dee4a7e6bf3c1f…

MALICIOUS

PDF

42.2 KB Created: 2020-08-11 03:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 255f24fddbf469a26f96a65eaeaec2f8 SHA-1: e09bb417d77f3d77fc691d32b352ac4f1b61e2b8 SHA-256: 81dee4a7e6bf3c1fe8fa8f878cd6768c67c78dde5179d1adfe6f4798d00240b9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link redirects to a malicious URL, likely intended to lead the user to further malicious content or phishing pages. The document body itself contains obfuscated text and the target URL, reinforcing the phishing or scam attempt.

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=thyroid+diet+chart+pdf
    • http://files.norahoffmann.com/uploads/1/3/1/4/131437725/9097368.pdf
    • http://kadesesog.jazikatxox.com/uploads/1/3/1/6/131606490/melodefito-vomuzu-ponowabidadega-luwerironon.pdf
    • http://files.saltwaterschool.com/uploads/1/3/1/4/131438098/remunitimujutok.pdf
    • http://files.suzannetank.net/uploads/1/3/0/7/130740191/dugifosam.pdf
    • http://mijopi.petesfishtales.com/uploads/1/3/1/0/131070487/balewazijuzikud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/nikapebagefidakezotizuwuw.pdf
    • https://cdn.shopify.com/s/files/1/0440/8773/8533/files/how_to_paste_in_vim.pdf
    • https://cdn.shopify.com/s/files/1/0440/9176/8984/files/libro_agilmente_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/chemistry_haloalkanes_and_haloarenes_ncert_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30617095305.pdf
    • https://cdn.shopify.com/s/files/1/0438/9719/2603/files/business_source_documents.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8472/files/author_s_point_of_view_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/2009_volkswagen_jetta_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2511/2994/files/mebujitosiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/veliwavuvanimufifubasimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/mudularazameraredetomusi.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_off00006813.bin
b7c03a786b8194ffb07f40b6592b118cff8a197c333fa9d077196e14bb7cdf55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6813 5084 bytes
font_01_sfnt_off00007963.bin
d8da48bbd77ae21981969c5195787f4f778d59d84e28ccfda2d707e8af4abc14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7963 10208 bytes

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