Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27341427b92fa38…

MALICIOUS

PDF

46.2 KB Created: 2020-09-02 15:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14be6f3d5a842877d379b0bd14205cc5 SHA-1: 9ca60a0fa8407fd3f7b195107a7a310111430862 SHA-256: b27341427b92fa38e787a6b5d249481cfec7e7f09bd81021facf428bdab98c51
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is part of a larger link farm hosted on static.usrfiles.com. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 https://ttraff.com/wix?keyword=royal+academy+of+performing+arts+london
    • https://static.usrfiles.com/ugd/b8c837_23bc1e9f24024887a160d64430be2cb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_956b4bcb422545049caddb2fe0b7163f.pdf
    • https://static.usrfiles.com/ugd/d775a9_48cb428f460d44b3875d0efb2d2ae795.pdf
    • https://static.usrfiles.com/ugd/ab059d_bf744a00aa4c46a888fcd04ce7f636e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a080ea90e7643849987ba25e7c634b6.pdf
    • https://cdn.shopify.com/s/files/1/0433/0281/3849/files/wudev.pdf
    • https://cdn.shopify.com/s/files/1/0439/9549/6606/files/96706504580.pdf
    • https://cdn.shopify.com/s/files/1/0459/6082/2943/files/xatuwodosolidalomeko.pdf
    • https://cdn.shopify.com/s/files/1/0429/3676/2527/files/css_navigation_bar.pdf
    • https://cdn.shopify.com/s/files/1/0453/2695/8747/files/gisowagoboluveraraxunebux.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9512/files/acrobat_dc_pro_edit.pdf
    • https://cdn.shopify.com/s/files/1/0443/6181/0076/files/hedging_instruments.pdf
    • https://cdn.shopify.com/s/files/1/0430/6481/9874/files/felder_and_rousseau_4th_edition.pdf
    • https://static.usrfiles.com/ugd/74c34a_9d4de248effe4505a6508e7953620370.pdf
    • https://static.usrfiles.com/ugd/857e61_17266f3def1c47349ef0226bedf193fa.pdf
    • https://static.usrfiles.com/ugd/44b221_4343434fd56f4aedafaab956e01ebe7c.pdf
    • https://static.usrfiles.com/ugd/18122d_97e9b1023df94fe2813ea33c662587c4.pdf
    • https://static.usrfiles.com/ugd/0779a3_0bc34b9906fa4a33a16876cfcb1eee3a.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_off000074be.bin
c9512853b082740355839d13e03987590786563d24e869d14c856eac962c29a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74BE 5584 bytes
font_01_sfnt_off000087b6.bin
4da83f00a21b1934c1e1652a633af0c01593660981905130b5c403f95e795827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87B6 10384 bytes

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