Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfba60a4dd3f841…

MALICIOUS

PDF

51.0 KB Created: 2020-04-15 05:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d89b40797b652f7e835f86c8b3a16399 SHA-1: d73d044c1ebf9291548be87405e966d475613d7c SHA-256: 8bfba60a4dd3f8415c7b1054f28b9063bba2e739e9bffd354a5242f4a83562b3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains text related to 'Elementary statistics mystatlab answers', which is likely a lure to encourage users to click on the embedded malicious links. The ML classifier strongly flagged this PDF as malicious.

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://lakewoodelementary.net/uploads/1/3/1/3/131379769/131379769.html#elementary+statistics+mystatlab+answers
    • http://dedoverde.info/uploads/1/3/0/5/130551700/256583.pdf
    • http://herbalefiyasamkocu.com/uploads/1/3/1/6/131636576/3581894c4942f.pdf
    • http://loyrayclemons.com/uploads/1/3/0/7/130739525/vebowesuduruvigegum.pdf
    • http://myvalueadvisor.net/uploads/1/3/1/4/131453530/woxuseke.pdf
    • http://instadate.company/uploads/1/3/0/2/130270897/gowoliwi.pdf
    • http://fjlclothesaccessories.com/uploads/1/3/0/5/130550880/biveferapirifofumura.pdf
    • http://lilisgardenrebloomed.com/uploads/1/3/1/4/131408068/3e70118d2f9.pdf
    • http://eilermannfamilyvideos.com/uploads/1/3/1/4/131483209/45124ec6.pdf
    • http://makinghimfamous.net/uploads/1/3/0/6/130639852/517905.pdf
    • http://mirandasmermaidtales.com/uploads/1/3/0/6/130604125/5134277.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_off00009abe.bin
7fcb4d1bbfb4a128f5d75934b6088ecfb766a1fc9686586e4ac2c055cbd1353b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ABE 9412 bytes

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