Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efe5436fa4527be…

MALICIOUS

PDF

47.9 KB Created: 2020-08-21 22:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 815d369ff90d9b5eaea2120cfa57c81a SHA-1: c30280f7dfe8e97a72a3ef4b033e865fa7476003 SHA-256: 0efe5436fa4527be0bcd2864574dbd8b078b10dcf00ffdfacdef2c20fef1e35d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.com'. The document body, though partially corrupted, includes the same URL and a physics-related title, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external PDF links, likely for SEO manipulation or to distribute malicious content. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this file.

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=potential+and+kinetic+energy+review+questions+answers
    • http://files.rudysingh.net/uploads/1/3/1/4/131437085/jelodozadofoguw_vazejituwuj_roxeromamisedu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7661/6353/files/mutasusagasozosibudejadol.pdf
    • https://cdn.shopify.com/s/files/1/0451/5436/9690/files/6684815213.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/diwosud.pdf
    • https://cdn.shopify.com/s/files/1/0438/2654/4802/files/18157361.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3082/files/asco_guidelines_for_her2_testing.pdf
    • https://cdn.shopify.com/s/files/1/0431/7829/5450/files/73817942961.pdf
    • https://cdn.shopify.com/s/files/1/0428/6640/9638/files/3ds_emulator_android_bios.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/advanced_engineering_mathematics_zill_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3652/files/ashrae_handbook_applications.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_off00007d26.bin
9d14754fa0ec6ad31aeb29710557087866d0bf2f068effac82ff051360d6696c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D26 5552 bytes
font_01_sfnt_off00009023.bin
bac944e1f81b22ae0ecffabaca09b91ab50823581851c3b78857507e52448191
pdf-font-stream PDF embedded font (sfnt) at offset 0x9023 10076 bytes