Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dac374a8820013…

MALICIOUS

PDF

40.3 KB Created: 2020-05-19 05:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a27f925ceda2044ba26118423b13889 SHA-1: 4d5d100965b21981f5bdbb10752beccf3cdcd2b0 SHA-256: c1dac374a88200130b87eb26619d81b84e445510612350d89204ba957310b287
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body, though partially corrupted, contains references to 'Pokemon reborn mega stones' and the authoring application, suggesting a lure to potentially unrelated content hosted on a network of suspicious domains.

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://avidaenglish.com/uploads/1/3/0/4/130491253/130491253.html#pokemon+reborn+mega+stones
    • http://missamericanfork.com/uploads/1/3/1/3/131383953/9ce91d606baf4a4.pdf
    • http://cprfordaycareproviders.org/uploads/1/3/0/5/130543467/bukub_joxeg_pijosexomupogog_rekudarakig.pdf
    • http://clarityconcepts.org/uploads/1/3/0/6/130604951/0fae086a47.pdf
    • http://leica-a-la-carte.nl/uploads/1/3/0/6/130620543/6922629.pdf
    • http://shannonscraftycreationsaus.com/uploads/1/3/0/5/130589286/2824074.pdf
    • http://jabir-organix.com/uploads/1/3/0/6/130640109/midobo.pdf
    • http://ediballoons.com/uploads/1/3/1/4/131438114/016b22fc3bbf3b.pdf
    • http://sbest.space/uploads/1/3/0/5/130544652/12eedf35807e.pdf
    • http://nackip.com/uploads/1/3/0/5/130539097/laxekuvu.pdf
    • http://labuilders.org/uploads/1/3/0/7/130740123/3884812.pdf
    • http://roryward.com/uploads/1/3/0/5/130539936/632609.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_off00006545.bin
affc08cba94ae4614ddb04d7ebc983e641d260fdbef4ac44e5d8908eb79efdcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6545 3316 bytes
font_01_sfnt_off0000712b.bin
7d04d8e1710a116735d90835a8d8f6d4a28dfde55401a6f0ee59e46d38cd981e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712B 10328 bytes

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