Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6662da3f6f19ef…

MALICIOUS

PDF

38.3 KB Created: 2020-08-17 07:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f4ff5b94a9006b6751843d680235555 SHA-1: 1a5bb25ca177b24cfba36c35ed09f1c038e5124f SHA-256: 7d6662da3f6f19ef2a8d70b88722730815a88a641bdefa9b928e22c7c47dd41b
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. Another critical heuristic identified a large link farm pointing to external PDF files. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to malicious infrastructure through these links.

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.com/pify?keyword=checklist+template+for+observation
    • http://zutaboma.dplpoker.com/uploads/1/3/1/6/131636664/xibumokonugekawo.pdf
    • http://files.mydadnmom.com/uploads/1/3/2/7/132710795/nuwuvulerenejatagidi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/rixanamesu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9343/3246/files/tecnologia_da_informao_e_comunicao.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/jisogafubite.pdf
    • https://cdn.shopify.com/s/files/1/0428/0634/5895/files/assetto_corsa_gt3_cars.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/62052645578.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/guardians_of_the_galaxy_2014_1080p_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/rorapijitokawomupemis.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_off000058aa.bin
c5cbcc2247ffef573f2c8882ee611262c80416b892940ff50bd94238f0544a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58AA 5424 bytes
font_01_sfnt_off00006aef.bin
9194bdff0df80cce679edf60b7b936e9807781556c3506024c87c36147c05630		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEF 9892 bytes

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