Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f8a2bf77d6e285…

MALICIOUS

PDF

36.1 KB Created: 2020-04-15 06:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0eae93caf001b37e9a9b9abd7dea1b1a SHA-1: 5cb3d7dd0c260e738c29c7ed38832ebe5f860236 SHA-256: 31f8a2bf77d6e285a10c15e02e2a54c9151a35e51b9a4d8577651ba13fd1397e
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO spam, with numerous embedded URLs pointing to other PDF files hosted on various domains. The ML classifier strongly indicated maliciousness. The primary attack pattern involves redirecting users to a network of SEO-optimized content, likely to generate traffic or serve further malicious payloads. The document body contains a title that appears to be a lure.

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://floralfaeriedesigns.com/uploads/1/3/0/4/130435734/130435734.html#discerning+the+voice+of+god+answer+key
    • http://bluelotustribe.com/uploads/1/3/0/6/130604694/pubofitotepukunotil.pdf
    • http://isaacgoovaerts.com/uploads/1/3/0/5/130547812/jeleliroruxuk_noxabapez_xevepokotu.pdf
    • http://rachvernon.com/uploads/1/3/1/1/131164016/5937ce0ddc518.pdf
    • http://decolonization-repatriation.com/uploads/1/3/0/5/130542727/lanikoles-losalogufipive.pdf
    • http://livearbonne.com/uploads/1/3/0/6/130640051/zujabuvop.pdf
    • http://vintagejunkster.com/uploads/1/3/0/3/130324324/jefidax.pdf
    • http://balanceonbroadway.net/uploads/1/3/0/6/130639107/5041308.pdf
    • http://eaglestonegrp.com/uploads/1/3/0/6/130622111/4122980.pdf
    • http://lilyarndesignco.com/uploads/1/3/0/4/130435571/veduvegijejudorimax.pdf
    • http://howimdoingit.com/uploads/1/3/0/4/130436450/kutadoxunibol_nogamupumezuj.pdf
    • http://androiddiscoveryworld.net/uploads/1/3/0/2/130289333/wanixadeve.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_off000065ed.bin
21aae906a1319b320dc21e8b6c06e4b83ca2a784b8a92a11a5b337dfe96c3942		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65ED 7828 bytes

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