Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bf91c30d055a77…

MALICIOUS

PDF

45.9 KB Created: 2020-04-07 06:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 139fb86d5159db215992bbcb3ed15869 SHA-1: 870be00ea63562e2a7cc87bc4da9ba42cc9a8d8e SHA-256: a6bf91c30d055a77ca575721ffaf17ef2e58a9bf7acd974d74dd5d1fab4f39c9
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or content distribution network, as indicated by the 'PDF_SEO_LINK_FARM' heuristic firing. It contains numerous external URLs pointing to other PDF files hosted on various domains, all with numeric slugs in their paths. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains garbled text and embedded URLs, suggesting it's not intended for direct user consumption but rather to facilitate navigation to other malicious resources.

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://twistedsugarut.com/uploads/1/3/0/3/130323705/130323705.html#imagenes+de+figuras+literarias+hiperbaton
    • http://tonkaforce.com/uploads/1/3/0/6/130603896/1853723.pdf
    • http://budgetweddingsingapore.com/uploads/1/3/1/3/131383766/2900299.pdf
    • http://globaleducationalsolutions.org/uploads/1/3/0/6/130621983/5077340.pdf
    • http://granitetimeshare.com/uploads/1/3/0/2/130272638/suronawububotat-rotuf-wuwetopuj-fevov.pdf
    • http://maykue.com/uploads/1/3/0/2/130274269/e2ed326.pdf
    • http://larryjonesstudios.com/uploads/1/3/0/7/130738799/vimip.pdf
    • http://mcvminc.com/uploads/1/3/0/5/130551794/zadodez.pdf
    • http://barossatdu2017.com/uploads/1/3/0/4/130436318/xeboku.pdf
    • http://grambogames.com/uploads/1/3/0/2/130289736/pamegokabavu_xapafuratolaf_nopugufiz_zadimepifojim.pdf
    • http://refundsaregood.com/uploads/1/3/0/5/130589241/bipas.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_off00007de4.bin
34842b26342f35c1192058c9c4a03c9a8adf5f84d99a2eac16ffaf59f04fe046		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE4 9144 bytes
font_01_sfnt_off00009ee7.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE7 2652 bytes

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