Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba50c29ea1f8c768…

MALICIOUS

PDF

32.0 KB Created: 2020-09-01 02:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8f016aeb8296ae3423d6ba30551056a SHA-1: e50693957bd8dd42a676d897a2bac8bf164a8e4e SHA-256: ba50c29ea1f8c768b5578492ff34bcfa38066ab840e5d7834a1075de868f3540
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. This suggests the document's primary purpose is to direct users to malicious websites, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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=dewsbury+reporter+drugs
    • http://www.dewsburyreporter.co.uk/Sanomalehti
    • https://static.usrfiles.com/ugd/36f25b_77c0e226b35d41d4a8cc404abb5a00d3.pdf
    • https://static.usrfiles.com/ugd/97493d_774ddb8553b649268b51b2465f875d71.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_c36ea0d8c0064a87a382c6708443bffe.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b522b4db0354ce3b6b1b87d5fc3bc7c.pdf
    • https://static.usrfiles.com/ugd/5cf23b_74a8389daeff4c409fe7457bde6dd25c.pdf
    • https://static.usrfiles.com/ugd/286fb8_6bc104bee6e14c1ba6298c83b7afb955.pdf
    • https://static.usrfiles.com/ugd/b8c837_07412429a325477597f10d210de4cc55.pdf
    • https://static.usrfiles.com/ugd/6f9b04_81bbe6529f1a4c208d7d4242730eb6bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_eeb7b8ec05764115b8b8a780d8230f3b.pdf
    • https://static.usrfiles.com/ugd/516793_d31668b0c9f747d9b1bc6781ac3f79c4.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_off00004029.bin
cbda3cd8d64771ca864580dc18166368361d78c2ba718cdd90209851e34cdb63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4029 5220 bytes
font_01_sfnt_off00005210.bin
d716d7faaa51b5e1fe03c67b6d52335832911291abcf4528d4017b633c0b05b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5210 9644 bytes

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