Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8e12a8d4adc6b8…

MALICIOUS

PDF

45.9 KB Created: 2020-07-26 17:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 239c4c47fc978105f3e1abebac99e226 SHA-1: 18e3109219977aa1884518416a17ede484a2ba2f SHA-256: 6f8e12a8d4adc6b804b0a83c6297622c91c37caaf696857a7781b08ad963851d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to potentially malicious redirectors, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to drive traffic to external sites, likely for phishing or to serve further malicious 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.com/pify?keyword=introduction+to+naval+architecture+gillmer+pdf
    • http://files.clooneyns.com/uploads/1/3/1/4/131453177/8100586.pdf
    • http://files.reelectjudgetabbey.com/uploads/1/3/2/7/132712545/xijube.pdf
    • http://files.standrewspaisley.com/uploads/1/3/1/6/131637774/2211078.pdf
    • http://files.gamesoundplanet.com/uploads/1/3/1/6/131606128/1440c4e9f92b.pdf
    • http://files.kingspointpottery.com/uploads/1/3/1/3/131382243/rumepol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7790/1214/files/rudoxivolerigoxixuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/5067/2033/files/sewikizevisodupidi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/nitoliwowiforapovinudip.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/87998424219.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0160/files/16762358350.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6017/files/47346736889.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/51232212356.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/keredowowut.pdf
    • https://cdn.shopify.com/s/files/1/0434/1337/3084/files/62128694136.pdf
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/80313666862.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/71796421942.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/27879533022.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_off00007469.bin
f9586bb4b4a2dc3dff0c31c29378654903c71975fad6ba279e6d8c311c26081f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7469 5272 bytes
font_01_sfnt_off0000862a.bin
ee76cfe383613f8d5dd1e90b86960a5f8b464e6c8f566394208a7755f94e7c93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x862A 10440 bytes

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