Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d925463f000efe0…

MALICIOUS

PDF

45.2 KB Created: 2020-08-08 15:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eab31b4c6a30c0e144d0a87e6ab7754d SHA-1: 014d322117e8454ac04933267aaf945d1b0951a5 SHA-256: 2d925463f000efe0feada8aca01f3e48bc4227150c313bf0f18f47399bea313a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though obfuscated, contains the URL that is also present in the heuristic firing. This suggests the PDF is designed to lure users into clicking malicious links, likely leading to further compromise.

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=integers+adding+and+subtracting+worksheet+pdf
    • http://files.marmiger.com/uploads/1/3/1/3/131379042/bemaz-rukipopavoju-favoxiji.pdf
    • http://files.darrencormier.com/uploads/1/3/1/3/131380308/0f79481505b.pdf
    • http://files.magiqatlas.com/uploads/1/3/0/8/130814513/zivatemurijupizowigi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9605/files/how_do_i_reset_a_github_repository.pdf
    • https://cdn.shopify.com/s/files/1/0429/3358/4028/files/dafoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3806/5308/files/42253592072.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/sawabulabopofegipo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0023/files/zusetonumilo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/xedorujago.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/rumivolaraledomodopug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0124/0985/files/nazulibarigano.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/89184771447.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3669/files/toziliro.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068e4.bin
39d57b360bf1842d95afd31d4344301cd2f789029713fb1ba9b90f257ad6a5ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x68E4 5620 bytes
font_01_sfnt_off00007c11.bin
0e734ca3c297443a290b7a9842ca99d7d315bf91127875a956486ea6889ccdf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C11 13684 bytes