Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6a6ac3d5b81cce…

MALICIOUS

PDF

39.6 KB Created: 2020-03-20 14:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a85f97c03363137fc103dffb65038d6 SHA-1: daf956c55c104aada19ef0a3f4f9e2ac15534408 SHA-256: 8e6a6ac3d5b81cce92c663642b41b7bf38207550006d318816a8b57fda8fcc4a
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farm behavior. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://thepictonsilo.com/uploads/1/3/0/5/130550992/130550992.html#epoca+helenistica+de+grecia
    • http://ecceko.net/uploads/1/3/0/6/130604158/5bee87ae5f27310.pdf
    • http://factprocessing.com/uploads/1/3/0/6/130604114/8354355.pdf
    • http://stoolfeathergames.com/uploads/1/3/0/8/130814247/5356783.pdf
    • http://www.petersfieldgatehouse.org/uploads/1/3/0/2/130289573/363011.pdf
    • http://arcticethics.org/uploads/1/3/0/5/130551258/9847610.pdf
    • http://musicforsoho.com/uploads/1/3/0/6/130621873/9ffe4a1a.pdf
    • http://unlockedpassioncoaching.com/uploads/1/3/0/3/130312984/1337823.pdf
    • http://christianlifebc.org/uploads/1/3/0/5/130588885/07edad88b26db.pdf
    • http://365poolspa.com/uploads/1/3/0/5/130590756/ee9148.pdf
    • http://standoutindallas.com/uploads/1/3/0/8/130814353/vilogebukevadep.pdf
    • http://hack-up.org/uploads/1/3/0/6/130639503/sugif_kuputomezum.pdf
    • http://shotwellanalytics.com/uploads/1/3/0/5/130545633/b18f96212.pdf
    • http://www.enerselect.net/uploads/1/3/0/6/130639161/nisajok.pdf
    • http://vincentoffroad.net/uploads/1/3/0/7/130775076/a3f8b6421.pdf
    • http://www.richardsonladyeaglebasketball.com/uploads/1/3/0/5/130589126/texivunaboxofafoben.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_off00007180.bin
f90656a174de0ff073facb8bb57590b63e69d33e7ac7d16812bfb3dbba6e0f2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7180 8208 bytes

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