Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf8f0cab1685d97…

MALICIOUS

PDF

46.9 KB Created: 2020-03-10 02:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e00ddf8002b48ad3f56b60bfe88a040a SHA-1: 43e8b5cf3d5924315f7ec8a2915d4a74677a90fd SHA-256: ccf8f0cab1685d971f3f7c4645a4b0e74a49b30f83370c29a49d94d3b7834cc5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a large number of external links to various websites, many of which appear to be dynamically generated or part of a link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern involves redirecting users through this network of URLs, potentially for SEO poisoning or to serve further malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

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://cornwallpolice.org/uploads/1/3/0/5/130540097/130540097.html#grouped+frequency+distribution+categorical
    • http://www.elisacantamessa.com/uploads/1/3/0/5/130590678/5336476.pdf
    • http://www.shopdorothys.com/uploads/1/3/0/6/130620789/pufomerebopomisaja.pdf
    • http://misterdandtheteam.com/uploads/1/3/0/3/130379803/436e85a8872.pdf
    • http://rebieramoso.net/uploads/1/3/0/6/130620217/pesupagofuto.pdf
    • http://www.jenwalls.com/uploads/1/3/0/2/130271043/tabepuruzude_sodamipeli.pdf
    • http://555consulting.com/uploads/1/3/0/5/130589229/dabukafarovovi.pdf
    • http://meademechanical.com/uploads/1/3/0/3/130323767/sagawumodewafax.pdf
    • http://paradisefirehelp.com/uploads/1/3/0/5/130590467/5819915.pdf
    • http://geraldpalmer.ca/uploads/1/3/0/6/130620525/79853bb.pdf
    • http://106redirect.com/uploads/1/3/0/8/130814021/2013279.pdf
    • http://angstmanartistry.com/uploads/1/3/0/7/130775647/95b7c.pdf
    • http://ovariangermcell.org/uploads/1/3/0/6/130620836/23037721686.pdf
    • http://siddhearta.com/uploads/1/3/0/6/130620902/6d9c8be3b.pdf
    • http://www.soflomobilechiropractic.com/uploads/1/3/0/8/130813332/0dcf8008736.pdf
    • http://cpanel.bigdipperbeeco.com/uploads/1/3/0/4/130436236/bobevufi.pdf
    • http://ailesburylite.com/uploads/1/3/0/3/130324050/rotelo.pdf
    • http://store.themovementdr.net/uploads/1/3/0/2/130273589/2304645.pdf
    • http://centralmarketdistrict.org/uploads/1/3/0/5/130551957/9563a30c6a9189d.pdf
    • http://dailyfact.org/uploads/1/3/0/6/130639790/3502601.pdf
    • http://connectingtocommoncore.com/uploads/1/3/0/8/130874295/1269636.pdf
    • http://mail.q-four.com/uploads/1/3/0/7/130776381/54c01366ece.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077cb.bin
1a7e778b2e4baadcd883608143ed096060e42e14c4d87ace6a10178e0846e7bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CB 8668 bytes
font_01_sfnt_off000098f1.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F1 16036 bytes

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