Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c079b450061d5f…

MALICIOUS

PDF

60.3 KB Created: 2020-08-30 22:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f561a3281aa989dd7495ab07465fd464 SHA-1: 329080af599cfc4c82eb9049f574b751323ba141 SHA-256: 58c079b450061d5f9ae9a476898bf6fc7b863a02f5de6d28b39dcebf16c9dc30
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same text as the malicious URL's query parameter, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/wix?keyword=how+do+sights+work+on+a+gun
    • https://cdn.shopify.com/s/files/1/0431/9232/0161/files/8451010134.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.pdf
    • https://cdn.shopify.com/s/files/1/0448/3586/4736/files/ibps_so_recruitment_2019_application_form.pdf
    • https://static.usrfiles.com/ugd/3e9e83_f222337f42ba4214b1897d67e3789bab.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_ea0e8edfbc4f4dbea6c1d58d546fb6d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f843f2230d04802a9bf72260ef7aaef.pdf
    • https://static.usrfiles.com/ugd/b8c837_15216b0e15844e7fbff76eea20b523a7.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_1c7188804cb94a2b86b94421c31da6b0.pdf
    • https://static.usrfiles.com/ugd/455f95_76850434ab8948a2a0be52965e2befaa.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_off0000ac6c.bin
8f6d2a596fbd1457f11b0fc54ab4d8c87937c5edbcc7388b588ee1c4bcddecb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6C 5172 bytes
font_01_sfnt_off0000be10.bin
f9114d9172bd518ca3d74848bf0350946461819e8bb0c3121ea989df9d7f7f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE10 11660 bytes

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