Malicious PDF — malware analysis report

Static analysis result for SHA-256 b504c6921affd4bd…

MALICIOUS

PDF

42.4 KB Created: 2020-04-04 15:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d274317a3843fd88f8a6be2ac4b5af2 SHA-1: 4aab1303e1820ed38a3552b8eab2a1c645ec64de SHA-256: b504c6921affd4bd33339ce98d747105f15294e4a5e5953caf748f7ddef61d28
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The document body, though partially garbled, includes a question about historical commerce and embedded URLs, suggesting a lure to trick users into visiting these sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm, pointing towards a malicious intent to drive traffic to potentially compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://fundraisers-aylsham.com/uploads/1/3/1/4/131452904/131452904.html#cu%C3%A1les+fueron+las+principales+causas+del+renacimiento+comercial+durante+la+edad+media
    • http://tincoating.services/uploads/1/3/0/6/130621280/5d5189aa34e19bb.pdf
    • http://magdielsfashion.com/uploads/1/3/1/3/131381109/2026577.pdf
    • http://cadenheadsafety.com/uploads/1/3/0/6/130621429/lepefulapod.pdf
    • http://yourbirthandbaby.com/uploads/1/3/1/4/131407469/4872674.pdf
    • http://gyrocity.net/uploads/1/3/0/6/130603776/f35dd43.pdf
    • http://weefca.com/uploads/1/3/0/4/130435780/jodonu.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_off00007b3f.bin
774b01168f5523c10d4bf24b818357cdbcad167a9841820616410955f355b5fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3F 8292 bytes

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