Malicious PDF — malware analysis report

Static analysis result for SHA-256 0251dbc13d0291b0…

MALICIOUS

PDF

42.5 KB Created: 2020-08-07 06:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d9b9c13a6096694ff2fd32d85778169 SHA-1: 4ea58ae1448be3865a8af07d0a8c233d4cf1ebac SHA-256: 0251dbc13d0291b0607d5b55a5f3299d386f9a1349c37f422acddeb8d15a3a81
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract users searching for specific documents. This suggests a phishing or scam attempt to redirect users to malicious sites.

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=resumo+sobre+autismo+pdf
    • http://files.justinecelebrant.co.uk/uploads/1/3/0/7/130776205/1140420.pdf
    • http://bufupu.kingcountyexplorers.com/uploads/1/3/1/3/131384281/1861071.pdf
    • http://files.longroadsouth.com/uploads/1/3/1/3/131382274/bc871.pdf
    • http://files.syrinxfluteandharp.com/uploads/1/3/1/4/131452811/f2bfd9af45d3.pdf
    • http://files.pfed.org.pl/uploads/1/3/0/7/130775125/dizawusaxosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5490/4997/files/59983670255.pdf
    • https://cdn.shopify.com/s/files/1/0431/5938/8316/files/keto_diet_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6063/files/cubic_spline_matlab.pdf
    • https://cdn.shopify.com/s/files/1/0431/1747/8039/files/regal_kitchen_pro_bread_maker.pdf
    • https://cdn.shopify.com/s/files/1/0432/7640/2854/files/69789331817.pdf
    • https://cdn.shopify.com/s/files/1/0455/6773/8021/files/antibiotic_classification_table.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/83080848637.pdf
    • https://cdn.shopify.com/s/files/1/0432/4284/8418/files/tadikajizelowesesu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/gijigetewibo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/add_all_files_to_git.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/5591906484.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/75139496445.pdf
    • https://cdn.shopify.com/s/files/1/0436/0755/6258/files/balitexorore.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_off00006443.bin
663e77b7ccc1e1fbd4a84c95d4c0cfad7edb8e2d4e14dd373d2b9ff2d082e66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6443 5304 bytes
font_01_sfnt_off00007631.bin
9ceb796594d71ca68673762b774eaa44699a1c963cdb23c94ebe4bcf6ed4dd3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7631 11896 bytes

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