Malicious PDF — malware analysis report

Static analysis result for SHA-256 13074d096905c527…

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 01:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae386c30e2e1e286e93ea9d883639059 SHA-1: 738fd1333e78c370cca879bea8313b8fd67d8aca SHA-256: 13074d096905c527e6693baf749457c12ffc5e994c78d14094edcdd614e51e99
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign educational resources, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL for this malicious redirector. This suggests the document is part of a link farm or SEO poisoning scheme designed to drive traffic to malicious infrastructure.

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.me/wix?keyword=six+factors+that+affect+climate
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8032/6051/files/a_level_past_papers_physics.pdf
    • https://cdn.shopify.com/s/files/1/0435/7118/3777/files/polyelectrolyte_water_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0434/5842/9089/files/differential_equations_boyce_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/fegoneruzarixes.pdf
    • https://cdn.shopify.com/s/files/1/0440/5785/4102/files/wow_hallow_s_end_guide_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/2305821271.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2988/files/grammarway_4_express_publishing_answers.pdf
    • https://static.usrfiles.com/ugd/3b7182_28336487ffb04562b6ae4e8fd3bfb936.pdf
    • https://static.usrfiles.com/ugd/b8c837_01ea57b9614d43c18c39151d72285354.pdf
    • https://static.usrfiles.com/ugd/b8c837_70a1ffe7f8bc4e2f9c2a1297548aa03e.pdf
    • https://static.usrfiles.com/ugd/89c6ad_50476cee06504343a311ac1c0fc715e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_35abd24c862d4319b7e29aed266c0f7d.pdf
    • https://static.usrfiles.com/ugd/77eba6_cf7f042032984f43adb1316347c5ddf2.pdf
    • https://static.usrfiles.com/ugd/b8c837_b023001898134fe8b6c924ffb909eb18.pdf
    • https://static.usrfiles.com/ugd/b8c837_4622dc215d2e4f94b6f89ab7e5d0f771.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_off00005fa0.bin
0a2b4f34e08de70555730079ce2c82088625fdadd7a5c12935ab7556cba80f91
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA0 5292 bytes
font_01_sfnt_off0000716f.bin
83eaa6890ef8cde46eb1552b8c612dbe1ed1b58786ad0fecb49f4c699eb2fa2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x716F 9860 bytes