Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bba5bfae1779fe1…

MALICIOUS

PDF

41.9 KB Created: 2020-08-15 02:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daa144c609933141025b4831e1a71008 SHA-1: 8d806ae206b9ebf4f0b93cc8689be99483b4f440 SHA-256: 0bba5bfae1779fe1e7a7b5837f7cd511b794a03619c75e0d36252cb08ad94ba7
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains URLs that are part of this link farm. This suggests an attempt to direct users to malicious sites, likely for further exploitation or phishing.

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=android+custom+bottom+sheet+behavior
    • http://files.cinnamongirlpurebotanicals.com/uploads/1/3/1/1/131164520/3411592.pdf
    • http://files.jordonministries.com/uploads/1/3/2/3/132303068/1610822.pdf
    • http://wuvavabit.thebiocompatibledifference.com/uploads/1/3/2/3/132302780/a2c676.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3299/2161/files/12524615088.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/gezelararusabap.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0826/files/48414550643.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/genozijelazukuwogukevuwag.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0512/files/91512498208.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/role_of_biomarkers_in_environmental_risk_assessment.pdf
    • https://cdn.shopify.com/s/files/1/0448/7122/1410/files/pares_biomagneticos_espirituales.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2439/files/2729849727.pdf
    • https://cdn.shopify.com/s/files/1/0437/3020/6885/files/sistema_circulatorio_resumo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4250/files/thomas_calculus_13th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5237/files/37470034389.pdf
    • https://cdn.shopify.com/s/files/1/0438/8572/3816/files/askep_bronkitis_kronis.pdf
    • https://cdn.shopify.com/s/files/1/0432/1427/4720/files/summarizing_and_paraphrasing_exercises_with_answers.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_off000064a5.bin
aca0d3e39f346e44fe5dc4b0b24b02b0986730dadabac7cc183cd2825d4fb7c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A5 5336 bytes
font_01_sfnt_off00007696.bin
b5f6936384620b426f969917792e0d3ae30d3c736b80076f95f3d5c3502d7b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7696 10592 bytes

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