Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e9dc75998c2180…

MALICIOUS

PDF

51.4 KB Created: 2020-09-14 04:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d814c0a101fb2dad324e51d240a77243 SHA-1: afa84fa88bb132e7673f288d8c177b8d47654534 SHA-256: b5e9dc75998c218067a957c1e459e74b313c0b0c40151d767dad66b3363155da
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be part of a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains the target URL which is intended to lure users into clicking on a fake concert advertisement. This likely leads to a malicious website designed for phishing or malware distribution.

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.club/wix?keyword=britney+spears+concert+france+2020
    • http://files.uintahffa.net/uploads/1/3/1/4/131453917/bazilu.pdf
    • http://mafabu.nclandandhome.net/uploads/1/3/1/6/131606228/rodewukozubu.pdf
    • http://parakezex.forestcloudsnaturetherapy.co.uk/uploads/1/3/1/1/131164250/6313375.pdf
    • http://nupiz.adventuresoflittle.ca/uploads/1/3/1/3/131398379/zenovafoza.pdf
    • https://static.usrfiles.com/ugd/ca32a8_76cfe71d448249e69956378b82829ffa.pdf
    • https://static.usrfiles.com/ugd/fb5067_94e911e33570491cadbe29aac112613a.pdf
    • https://static.usrfiles.com/ugd/724fb5_0a6db47d08da4553be39f8eab6419553.pdf
    • https://static.usrfiles.com/ugd/479fa9_3088176b42144090a7350826e4ebe0c8.pdf
    • https://static.usrfiles.com/ugd/440e29_9efb3d34aa9b4f4ca574c80118240bf0.pdf
    • https://static.usrfiles.com/ugd/a1fb72_acf30a1dad0a4432b11e6cd27eda7160.pdf
    • https://static.usrfiles.com/ugd/5926b4_5043212f443c47c0976b618e79b89667.pdf
    • https://static.usrfiles.com/ugd/c3f88d_cef2a19356c846ae925cecae463c6c29.pdf
    • https://static.usrfiles.com/ugd/9bd82e_f57f3e278e614e5f81c09863d6caea04.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c00d0d0797c4653b174009bcae3e607.pdf
    • https://static.usrfiles.com/ugd/9904c2_dbe95ab8b7544cb08414844b78069a01.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_off0000899c.bin
77eab81bd26f46362dd1a5f743a797d1c5696074caca4ae94d308515677e0e9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x899C 5400 bytes
font_01_sfnt_off00009c1a.bin
6c1d4c17dba5dcbb93ff41f5e1157c5ef44fab113685e81c7ef88d2284867b0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C1A 10640 bytes