Malicious PDF — malware analysis report

Static analysis result for SHA-256 905afa3f4de0937d…

MALICIOUS

PDF

40.5 KB Created: 2020-08-08 13:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf0fb16903d3a7c54c017c6c93e1a6da SHA-1: ad50100bca51179d0d1ad5e8b553d9e59a6f4f2b SHA-256: 905afa3f4de0937d8ebad2a9307d9c484161c7f2df39e9351497a587d007efea
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, indicating a pattern of redirecting users to external sites. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=angles%20formed%20by%20parallel%20lines%20worksheet%20pdf
    • http://dipobewu.collegeidcamps.net/uploads/1/3/1/1/131164250/kebolavuzulo.pdf
    • http://files.icbp2017tw.net/uploads/1/3/0/7/130776241/2017300.pdf
    • http://files.twistedoysterboats.com/uploads/1/3/2/7/132740384/govigasipunekep-mazunigef-numukop.pdf
    • http://files.vvandthevoid.com/uploads/1/3/2/6/132680808/semudezewitug-bedusukiniteri.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/56344912250.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2138/files/high_school_chemistry_textbook_prentice_hall.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/piredunizozetojulifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/48439018955.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/biological_molecules_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/5957/5958/files/7710661097.pdf
    • https://cdn.shopify.com/s/files/1/0433/5720/8731/files/tuhaf_bilimler_akademisi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/whirlpool_ultimate_care_ii_washer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/wazavujizo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0765/5579/files/jotidavuwejokupudu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/kaxeretisanuzodotaxoduve.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8080/files/62682343392.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0605/files/kezonumunavizug.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d36.bin
f0f629baea43fc4b047497722cf6f38adcf5374a29ead0d2b76905f0ec33d63a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D36 5844 bytes
font_01_sfnt_off00007103.bin
cddecf9f63f95b28691fd591eb2d661437494090ffcf7d79fff2bb6fdb645ab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7103 10320 bytes

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