Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2aa30f031873733…

MALICIOUS

PDF

62.1 KB Created: 2020-08-12 06:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aba499d7bd1e8cb080c546cb67ae8b72 SHA-1: 0865dc32caf1b206a61166a3a6a5162831721a81 SHA-256: a2aa30f03187373384b1e80994f43e205c44effec8341c3d87947bc40a660724
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL that appears to be part of the malicious infrastructure, suggesting the PDF's primary purpose is to lure users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=circulatory+system+pdf
    • http://files.m4detail.com.au/uploads/1/3/0/7/130739143/a463e13b227a5.pdf
    • http://files.suntiments.com/uploads/1/3/2/6/132681308/sakesamo.pdf
    • http://files.advanceprolighting.com/uploads/1/3/1/3/131383760/kevofuj.pdf
    • http://files.golffordreams.com/uploads/1/3/1/3/131382243/sidomope.pdf
    • http://lubidi.buybooknookbooks.com/uploads/1/3/2/3/132303382/jabel_woxonupijajogaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0966/2366/files/35336193569.pdf
    • https://cdn.shopify.com/s/files/1/0454/7844/5206/files/calligraphy_worksheets_printable.pdf
    • https://cdn.shopify.com/s/files/1/0431/0709/0581/files/33091436656.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8833/files/xusozuxavikiromisemedorew.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/xodubagilasowuzilinu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/poruxujudowubosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/simuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/3269/1363/files/bexafadezodoxobif.pdf
    • https://cdn.shopify.com/s/files/1/0431/8819/1394/files/definition_of_qualitative_research.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7067/files/45670153479.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0820/files/68512954281.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_off0000b517.bin
87fbec4060d503fea1645ea1b39c4a02324e1af668b63ac6ff570f7961fb46d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB517 5308 bytes
font_01_sfnt_off0000c710.bin
d9c850e558a70eb762fd546dd3b9c63fe0cf582d1d9c1ecc9138481391dfd221		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC710 10608 bytes

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