Malicious PDF — malware analysis report

Static analysis result for SHA-256 048fe513bdc2e0b9…

MALICIOUS

PDF

39.5 KB Created: 2020-09-08 06:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63a91dea0ff1ff5b56093e6bce0e8e17 SHA-1: 4b81b372aeb7a788a5ffedf4ba20ee33591529a2 SHA-256: 048fe513bdc2e0b96c872c31d287f9c1481bf742de7ecf176d8db749fbdbca22
154 Risk Score

Malware Insights

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

This PDF document contains a link to a known malicious redirector infrastructure at https://ttraff.club/wix?keyword=emphasizing+pronouns+worksheets. The document also hosts a large number of external PDF links, many of which point to benign Shopify-hosted files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment.

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.club/wix?keyword=emphasizing+pronouns+worksheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4245/5207/files/morojorelaluja.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/17049700689.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/18747227360.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/fazudulewiludomezajifob.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/nedududojudeluzogel.pdf
    • https://cdn.shopify.com/s/files/1/0451/4463/7605/files/cartesian_coordinate_system_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0438/2870/7485/files/academic_journal_guide_2018_by_chartered_abs.pdf
    • https://cdn.shopify.com/s/files/1/0462/6769/5255/files/basic_kanji_book_vol_1_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/4674/7805/files/unitech_international_ltd_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/19746967784.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/zilesolegimoxukil.pdf
    • https://cdn.shopify.com/s/files/1/0433/8489/7692/files/nilalumojamovog.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_off00005ccf.bin
4d3e57020506f966d1e52efe62783c002ab441408fa96e557d0ec9f233d1bad3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCF 5364 bytes
font_01_sfnt_off00006f01.bin
d4d83464e8b4479c6a63d0b403e5a8283e5d95c4db7fa09f1b93ba2bcde9f63f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F01 10176 bytes