Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b12c7a46684cae…

MALICIOUS

PDF

37.6 KB Created: 2020-08-10 23:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a56822d50d31f7848be7ee09178305f7 SHA-1: 16a9139a490948a558151e684a5f727460350c6e SHA-256: 30b12c7a46684cae0df0a7da11bcc9fb78c7b29f9384ad28bbd05238a79efe24
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one pointing to a known malicious redirector. The heuristic firings indicate this is a PDF link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.ru/pify?keyword=quest%25C3%25B5es+de+administra%25C3%25A7%25C3%25A3o+p%25C3%25BAblica+cespe+pdf
    • http://malak.andrekey.com/uploads/1/3/1/4/131482975/4638100.pdf
    • http://files.boshamretreats.co.uk/uploads/1/3/2/6/132681156/wisudafiliposurejuxe.pdf
    • http://befewaliz.richerdesignco.com/uploads/1/3/2/6/132682646/7275714.pdf
    • http://files.michaeltsarion.com/uploads/1/3/1/4/131454523/6708263.pdf
    • http://files.natalieeskewfitness.com/uploads/1/3/1/4/131438018/3692387.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49839171509.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/tubibugese.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/dipikunijozavupiso.pdf
    • https://cdn.shopify.com/s/files/1/0429/0304/4263/files/27360855364.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1973/files/etiologi_bronkitis_akut.pdf
    • https://cdn.shopify.com/s/files/1/0428/4337/3735/files/jasakad.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/65507932429.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/97943647523.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/zasipodezuboroduwafelene.pdf
    • https://cdn.shopify.com/s/files/1/0437/2211/3173/files/blueprints_neurology_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/5353/7685/files/cch_tch_trang_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/37697149835.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_off00004f1a.bin
2aa0dad8cabbc54aa8886aef136abd90d3236fff2c23b8f509f8b25bc3d22ed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F1A 6336 bytes
font_01_sfnt_off000062f6.bin
1c25067c0f7f40b72b4deeba051cef901d1e3ebff16865804dd37bc6a9953ae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F6 11832 bytes

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