Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b9dde6ab344758…

MALICIOUS

PDF

64.5 KB Created: 2020-08-31 23:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 299817b161a5c44078d44465e6478602 SHA-1: 26dae501d67e647c34d22eae783624303332b213 SHA-256: 73b9dde6ab3447584e1468bc753b6f7bcf244c0321485b72f7ed841720df7efb
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'pure planet app' and another URL pointing to a PDF on Shopify, suggesting a link farm or content hosting for malicious purposes. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=pure+planet+app
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/9396/5466/files/livre_cours_anglais_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0439/1724/6632/files/senesivazijesepu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2177/7570/files/lovesenelefusamozege.pdf
    • https://cdn.shopify.com/s/files/1/0432/6434/4219/files/25411564048.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/1569184464.pdf
    • https://cdn.shopify.com/s/files/1/0434/0432/9125/files/tupadijusatozajokaworexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4160/3239/files/pdf_to_doc_converter_online_zamzar.pdf
    • https://cdn.shopify.com/s/files/1/0436/5395/5742/files/25593647165.pdf
    • https://cdn.shopify.com/s/files/1/0430/7589/5447/files/bts_memories_2018_dvd_eng_sub.pdf
    • https://cdn.shopify.com/s/files/1/0430/9277/0977/files/oxley_holdings_limited_annual_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3199/files/resisukejix.pdf
    • https://cdn.shopify.com/s/files/1/0432/9770/2046/files/37351258279.pdf
    • https://cdn.shopify.com/s/files/1/0430/6416/4506/files/9670518714.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f5a.bin
b385b1f01d6b6da91366ea577b041bdfbc37f763918c518ff64735750974bcbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F5A 4360 bytes
font_01_sfnt_off0000ae25.bin
dbf4631c31595a37d36eb03c99ecf7ed77da0eae8a3eef9b4f201fcd2eb19e5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE25 10456 bytes
font_02_sfnt_off0000d1ee.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 16092 bytes
font_03_sfnt_off0000e6b5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 4324 bytes

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