Malicious PDF — malware analysis report

Static analysis result for SHA-256 58aa105683d2b38e…

MALICIOUS

PDF

43.2 KB Created: 2020-08-10 17:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc88ed3cd5c9a6449c235ade1eb997eb SHA-1: 89794cc729b9b746c200473e5bebeec4379ee4cc SHA-256: 58aa105683d2b38e723bdb81f8b730c731b1fff1d21207b28af3d5546c678901
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary URL leading to a known malicious redirector. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF files hosted on various domains. This indicates a likely attempt to distribute malicious content or lead users to phishing sites.

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=blunt+abdominal+trauma+guidelines+pdf
    • http://files.hempologyabq.com/uploads/1/3/1/1/131164431/rojinojowu_bixigeki_jedumuwotusi.pdf
    • http://files.brookeflemingfoto.com/uploads/1/3/0/7/130739144/kixikaxamofod_xujexev_bojiso_pasufexuzulezew.pdf
    • http://files.sweettcookies.com/uploads/1/3/1/4/131453429/5910023.pdf
    • https://cdn.shopify.com/s/files/1/0434/5603/7016/files/5115111328.pdf
    • https://cdn.shopify.com/s/files/1/0429/5730/8063/files/bunolufefibimadi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/31643840932.pdf
    • https://cdn.shopify.com/s/files/1/0435/5004/8420/files/guduturomewuzowuvomilijam.pdf
    • https://cdn.shopify.com/s/files/1/0433/8614/2876/files/84722141603.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/12404619607.pdf
    • https://cdn.shopify.com/s/files/1/0432/0424/7715/files/70579653585.pdf
    • https://cdn.shopify.com/s/files/1/0430/5443/2410/files/81289220123.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/jodetanopekiratawesid.pdf
    • https://cdn.shopify.com/s/files/1/0431/2963/4970/files/yajur_veda_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/87725179136.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/dupekofefekefuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/8022/8759/files/sample_html_files.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_off00006aa0.bin
8f031296f7944017b1898ee6e7590af3ca95ad8546f04f437b52d83b9bcbd7c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA0 5552 bytes
font_01_sfnt_off00007d62.bin
16cbb8145a0230d05836de0bc3601ba4f64269e9754f8962f9b31557d7ec075f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D62 10112 bytes