Malicious PDF — malware analysis report

Static analysis result for SHA-256 543ff9faf941b595…

MALICIOUS

PDF

36.3 KB Created: 2020-04-24 23:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d06fbdb522948aae4ef1314d70dd001b SHA-1: 3f3267fb7ce10e1749037d6d55621cdbb0993617 SHA-256: 543ff9faf941b5959ef3078ab5de72ee3006b47b0bbbb76b7036d0ee18b3f4a5
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to domains that appear to be part of a link farm or SEO scam. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, indicating the document's primary purpose is to redirect users to other sites. The ML classifier also strongly flagged this PDF as malicious.

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://bestratedlondon.com/uploads/1/3/0/2/130287808/130287808.html#sparklebox.+co.+uk+letter+formation
    • http://mobile-care.info/uploads/1/3/1/1/131163599/8279863.pdf
    • http://wise-owlwellness.com/uploads/1/3/1/4/131455072/lepajetapowororo.pdf
    • http://tacos-del-valle.com/uploads/1/3/0/2/130274281/sopitifavozolexuxud.pdf
    • http://mermaid.marketing/uploads/1/3/0/4/130488946/3be7a0e3d8c.pdf
    • http://medicaltrainingdubai.com/uploads/1/3/1/4/131407630/posamugitaba-japunuvobexepud-nezoboz-wimovekov.pdf
    • http://vsud51.ru/uploads/1/3/1/4/131483144/f6cd13a8c1f.pdf
    • http://capitolcommerce.org/uploads/1/3/0/2/130289561/xetevu.pdf
    • http://postalsolutions-hohenwald.com/uploads/1/3/0/5/130589278/ac6bf06bcd27c.pdf
    • http://masterbaitnadulttoys.com/uploads/1/3/0/7/130740490/jafujeka.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_off000064a3.bin
1dac8a6b840151ab489a9767ca8c9d55b6569514f07dd0bd044bcc000f80eac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A3 8544 bytes

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