Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bee6f19953405d1…

MALICIOUS

PDF

40.0 KB Created: 2020-08-24 09:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9a3ce51fc37f71d719d88ea89a2d7d4 SHA-1: d03a6609d54040cca4eb32f3ac063ea4a1793dab SHA-256: 7bee6f19953405d1a6950f364ceaabd37c0a1e789accaf4f5299897fe7c42e21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=solidworks+ausformung+tutorial
    • http://files.hhmath54.com/uploads/1/3/0/8/130874333/fusom.pdf
    • http://jurud.denisecummins.com/uploads/1/3/0/7/130740563/8578346.pdf
    • http://files.naydacollazollorens.com/uploads/1/3/1/3/131379748/dadujere_modiximifi_xivirulixuripuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5590/4918/files/counting_by_10_s_worksheets_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/nadusot.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9362/files/repesab.pdf
    • https://cdn.shopify.com/s/files/1/0439/1016/8744/files/questionnaire_template_to_get_to_know_someone.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/gazafotovewafirawunawemar.pdf
    • https://cdn.shopify.com/s/files/1/0449/9865/6158/files/adjournment_letter_format_income_tax_officer.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/70163826749.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/23313231449.pdf
    • https://cdn.shopify.com/s/files/1/0438/9679/9384/files/boramizolifalazobowagoza.pdf
    • https://cdn.shopify.com/s/files/1/0434/1635/4978/files/simple_weekly_budget_worksheet.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_off000060c4.bin
6d66fd53ee69d5aff9ad83c4ff101503b813e924c535febda55e4b194b34efb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x60C4 5488 bytes
font_01_sfnt_off00007363.bin
f47e182fc632babaff45c013955bd2e3ba6378fe2979c7c94e14abe48326c9d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7363 9184 bytes