Malicious PDF — malware analysis report

Static analysis result for SHA-256 69762c21fec88ce6…

MALICIOUS

PDF

43.7 KB Created: 2020-08-16 20:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57e2b056ef0c9cccbca21421ea9c796a SHA-1: 666b5949b0b07fd4ebe8215fd5c6389f3e02fda5 SHA-256: 69762c21fec88ce660914c9459bb6de9dac72f368fad4d66132a504e3fa9db3e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially obfuscated, includes the same malicious URL and references a benign-sounding topic to mask its true intent. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lead users to harmful content.

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=aprendizaje+cooperativo+johnson+y+johnson+pdf
    • http://jepifav.watertreeboerne.com/uploads/1/3/1/4/131454106/3627272.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6483/3686/files/mapreduce_paper.pdf
    • https://cdn.shopify.com/s/files/1/0429/8031/1203/files/kitatutagologojemikir.pdf
    • https://cdn.shopify.com/s/files/1/0433/5271/9515/files/bt_sport_2_stream.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8697/files/32522305631.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5882/files/33891238023.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/68092770960.pdf
    • https://cdn.shopify.com/s/files/1/0431/0020/9319/files/giwugikonifugodezoxikutip.pdf
    • https://cdn.shopify.com/s/files/1/0434/7455/0950/files/72784873771.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1217/files/bebekesafamewomapef.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_off00006995.bin
d2be48c12f9cb4907de003f5ba1f5d5f9678e4f57d2a1d63ce6bff3062bc15a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6995 5488 bytes
font_01_sfnt_off00007c4b.bin
56083e528eb1055914393026cfa77615e9dbd4d8560a151c14e7790b823c54ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4B 11172 bytes

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