Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e7b15347dc8167…

MALICIOUS

PDF

31.6 KB Created: 2020-06-01 06:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 085c513585247e2aff51f72f5428df9c SHA-1: 3a8e58e91e41c77dbff242e77c996f1d88836cfa SHA-256: f9e7b15347dc816707a43074c77fc3b8e35cd668119c73e8036671bcf735f23c
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to seemingly unrelated content, indicative of a link farm or SEO poisoning technique. The document body contains a lure related to watching a movie online, which directs users to a specific URL. This suggests the PDF is designed to drive traffic to malicious websites, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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://oj478.slpny.com/uploads/1/3/0/6/130620348/130620348.html#brothers+full+movie+watch+online+voo
    • http://notamodelbod.com/uploads/1/3/0/6/130620366/sejuzegaxawusaj.pdf
    • http://sosessays.com/uploads/1/3/0/2/130289430/forivakem-namiwirel.pdf
    • http://bookinggolf.com/uploads/1/3/1/6/131607053/fojupuritumi.pdf
    • http://autorepaircalgary.com/uploads/1/3/1/8/131872289/5890129.pdf
    • http://bubblecrops.org/uploads/1/3/0/6/130620952/4123377.pdf
    • https://feruvef.files.wordpress.com/2020/05/tunobekukotatapinobur.pdf
    • https://timowasufu57836677.files.wordpress.com/2020/05/54454627967.pdf
    • https://zaxobikatiwi.files.wordpress.com/2020/06/pagilufesujigeleje.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_off00004fcd.bin
5a88c0edb3cc8a15decd6fe2e7bd909b86e997843f83985eee1cb712e70c45ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCD 10616 bytes

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