Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e7d400e41f9aa4…

MALICIOUS

PDF

49.7 KB Created: 2020-08-05 02:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53bb9b67067e6cd7b79c236380798fa5 SHA-1: 34f3268f40fa180d454a40dfe4d3621e8d4ac320 SHA-256: 67e7d400e41f9aa447c1ade6292d91c9528bfe5d832280c84d1d02fb1e348bb0
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious redirector is a high-confidence indicator 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.cc/pify?keyword=causes+effects+and+solutions+of+land+pollution+pdf
    • http://files.jessicabaylisswrites.com/uploads/1/3/2/7/132741334/zemuxokerixizix.pdf
    • http://files.learnfrombarrymaterials.com/uploads/1/3/0/9/130969306/64767183d3cc.pdf
    • http://files.ebrahimkhanilab.com/uploads/1/3/1/3/131381802/1b2759dd.pdf
    • http://files.taylorsvilagboutique.com/uploads/1/3/1/8/131856160/a4de1cb7.pdf
    • http://files.torbayvts.com/uploads/1/3/2/6/132681479/661489.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5190/8249/files/gumaxajesemifubap.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/xebivenifoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4504/3880/files/english_grammar_course_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/52_states_of_america.pdf
    • https://cdn.shopify.com/s/files/1/0428/5880/7455/files/ximinakamom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6513/files/12285802150.pdf
    • https://cdn.shopify.com/s/files/1/0436/8764/1241/files/5965365107.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7201/files/escape_double_quotes_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/ecg_lectura.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/75743291762.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_off000084ab.bin
a0995082f814f76d5cf15ec52d22cf278755ba12dd2dfedcbd5efa57ed871738
pdf-font-stream PDF embedded font (sfnt) at offset 0x84AB 4960 bytes
font_01_sfnt_off0000959f.bin
768ca5e9d2787c83590614a85ea02537c105ee3e997457795ca41368f786d2cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x959F 10364 bytes