Malicious PDF — malware analysis report

Static analysis result for SHA-256 70388bf91a06b715…

MALICIOUS

PDF

40.5 KB Created: 2020-09-06 14:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6660aeec7143ad9b2cfb187c1d740608 SHA-1: be1df6ca4995f224ae312732d15558eb886a3680 SHA-256: 70388bf91a06b71520318323f925fb25af9920cef2aceef45489d4e182b883a3
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that masquerades as a software download, aiming to trick users into clicking it. The document body and embedded links suggest a lure for potentially unwanted software or further malicious content. The presence of numerous external PDF links, many pointing to benign content, indicates a link farm strategy to improve SEO for the malicious redirector.

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/wix?keyword=dotnet+framework+3.+5+free In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8415/1974/files/answers_of_ncert_history_book_class_9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/0601/6918/files/monster_high_escape_from_skull_shore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83142526711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/8817/9353/files/iupac_modern_periodic_table.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6825/8469/files/ocean_animal_word_search_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6013/3031/files/90514571044.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/inland_fisheries_ireland_salmon_reports.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/bootstrap_grid_system_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9487/5039/files/dudibezuroxinakeribotamuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/market_analysis_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3672/2588/files/60979894740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/1947/1781/files/28386814602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2760/3354/files/myers_psychology_11th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9121/3988/files/bikibonikatanut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9975/7474/files/66106919628.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6095 5176 bytes
SHA-256: 5f772307d378a70be259419473a995eef6bb71508c8d432a4d36801c63422e93
font_01_sfnt_off00007248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7248 10128 bytes
SHA-256: b94d3e04b5ad93d6fff890381b58b51f3c0492e195934a7d7c22fd68f1124cd0

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