Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6f8381822297e5…

MALICIOUS

PDF

34.2 KB Created: 2020-05-31 23:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f769f83026721994e3b607794da9016d SHA-1: 1a8631db3835d5203b7f9c796290d575153dfc9f SHA-256: 9c6f8381822297e518189f37ac40e0531c9db1cd6b44943d227686ac0249d5bb
94 Risk Score

Malware Insights

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

The PDF file contains a lure related to an 'Elementary music curriculum guide' which, upon inspection, redirects to a farm of external links. The PDF_SEO_LINK_FARM heuristic indicates a mass of external PDF links, suggesting a link-farming or redirection tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://x0520504xstreamtravel.xsideas.com/uploads/1/3/0/8/130813643/130813643.html#elementary+music+curriculum+guide
    • http://porterfg.com/uploads/1/3/0/7/130776889/kudulofofebo.pdf
    • http://vikibrown.com/uploads/1/3/0/7/130738505/1353847.pdf
    • http://alianzaconstruction.com/uploads/1/3/0/9/130969437/2157707.pdf
    • https://vusuletameta.files.wordpress.com/2020/05/82351523686.pdf
    • https://ziboruxupebi.files.wordpress.com/2020/05/71554549097.pdf
    • https://milerupefimu.files.wordpress.com/2020/05/47270243107.pdf
    • https://kalatojiza.files.wordpress.com/2020/05/52029730155.pdf
    • https://zadidepetox.files.wordpress.com/2020/05/jofejitav.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_off00005ac2.bin
b621287567a928318604acc30360c23ea98726977c68f8c59b84352531058b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC2 10200 bytes

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