Malicious PDF — malware analysis report

Static analysis result for SHA-256 5000f789c7fb09fa…

MALICIOUS

PDF

37.5 KB Created: 2020-04-18 07:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: df6668d103cb5739a59e9623adb09dfb SHA-1: ca4213c3afc7fe806949579394659407a7f59641 SHA-256: 5000f789c7fb09faae7ebd1399d3f81098a5d212b0406a7209c67e2bf77c697d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to PDFs with numeric slugs, indicative of an SEO link farm. The document body, though heavily corrupted, contains text related to 'ebook readers for android tablets' and the wkhtmltopdf application, suggesting a lure to external content. The primary attack pattern involves redirecting users to a network of potentially malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://thebusinesstip.com/uploads/1/3/0/6/130604749/130604749.html#best+ebook+readers+for+android+tablets
    • http://woulibamrestaurant.com/uploads/1/3/1/0/131071166/847a36739c9e.pdf
    • http://betterenergyproducts.com/uploads/1/3/0/4/130483748/6202363.pdf
    • http://robinsonenglish.com/uploads/1/3/1/3/131378936/gitujozof.pdf
    • http://gardenstatemarketing.com/uploads/1/3/1/4/131437354/84315.pdf
    • http://godeverything.com/uploads/1/3/0/4/130483515/03c5de68d3e64.pdf
    • http://lttransfersco.com/uploads/1/3/0/7/130740054/70376b1a8c1e431.pdf
    • http://cancer-dr.com/uploads/1/3/0/7/130739817/4d8db654.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006baf.bin
a55c17243317e9c894917b8d0d0d3fd509f930e4eb5285fb4f8bcc3d2c032dff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAF 7808 bytes

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