Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3b323ded1d6011…

MALICIOUS

PDF

41.2 KB Created: 2020-09-18 09:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2956e6e7f5cf1ed03bf91bfa96ba2f9a SHA-1: 00cbdaff89ca91af7471927b5520e52e2c33beea SHA-256: fa3b323ded1d60112df47b63f9da1f3f029fa55516ffa4317395fb82f349f31c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.club/wix?keyword=polymer+basics+worksheet+answers', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a lure to download further content or navigate to malicious sites. The ML classifier strongly flagged this PDF as malicious.

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=polymer+basics+worksheet+answers
    • https://4275eac9-5615-4b8c-aa88-ac3dc61fbcbc.filesusr.com/ugd/c8a981_3a9c4a8201d24ef9a971176c27a0f92f.pdf?index=true
    • https://96150be8-5e56-4bf2-9a01-3972685ac301.filesusr.com/ugd/98857b_1e1dba7e328e4d62a2eb10ea6fd32fbc.pdf?index=true
    • https://588d7188-71b7-4abf-81da-47c1f09ee513.filesusr.com/ugd/e7e4a0_7bc189a1e6544cebb4aae1055c5ab2e0.pdf?index=true
    • https://6fc1d4a9-c313-4c70-96c3-51da5a95e6da.filesusr.com/ugd/4a2613_00de6d7c8b574fdfa935462287d9e729.pdf?index=true
    • https://67ef2ce6-b11d-4e47-842b-163bfd5ba5b2.filesusr.com/ugd/f515ca_e96c732d139f49ee976f0d8df106954f.pdf?index=true
    • https://79ba474b-7d39-445d-b3c1-9aa6a86e0296.filesusr.com/ugd/a51aec_a947e9d1088e4a8eb11b7b319528de0e.pdf?index=true
    • https://246668b4-e5a2-4a8a-84e3-2a04b1085e82.filesusr.com/ugd/2f3216_d095b4a077fc41ce89543e65759cc563.pdf?index=true
    • https://a5ee9e5f-1b66-4825-b084-b2fd3523583c.filesusr.com/ugd/0a3240_8e87146b74354e4a872c70941be4ff20.pdf?index=true
    • https://e379c32b-3d07-48cf-8b01-7b845f378402.filesusr.com/ugd/bbdb65_df098d35ef63412493d732f7fd56646e.pdf?index=true
    • https://90d95367-6697-40a6-809d-3a4017a8b4f8.filesusr.com/ugd/8c7d07_0c518586b74840d388dd2f257223d202.pdf?index=true
    • https://8312a9d6-f587-4568-932d-380c9dd5dccf.filesusr.com/ugd/bfd504_4318a57c0cf243228220a8da71a96dcb.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/68819100678.pdf
    • https://cdn.shopify.com/s/files/1/0466/8925/5588/files/babylonia_fgo_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/3384/6175/files/johnson_90_hp_v4_outboard_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/82943021252.pdf
    • https://cdn.shopify.com/s/files/1/0434/4227/4471/files/jiduzobitukewam.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_off0000614d.bin
96e9ede0e7ab475e8dc2400c17f9b6b88ee514368b8a0843994ba787179621a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x614D 5436 bytes
font_01_sfnt_off000073b3.bin
10e1f0bd2c2647e7624cb79f97a6cd8e97c4b097ceb8b38632deeb56828022d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B3 10600 bytes

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