Malicious PDF — malware analysis report

Static analysis result for SHA-256 75474635254c1b00…

MALICIOUS

PDF

39.8 KB Created: 2020-09-21 00:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93930c5970555ef93b50a325d42b6f2c SHA-1: 86dc8f7dea5a4cd9f05cb812508067c3cefae4e0 SHA-256: 75474635254c1b007919367dcae708305df6a04273b41190ddbdd63b3862ba8a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external PDF documents hosted on disposable domains. One of the embedded URLs, 'https://ttraff.club/wix?keyword=topologia+de+estrella', is identified as a malicious redirector. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent. The document's structure and content suggest it is designed to lure users into clicking through a chain of links, potentially leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=topologia+de+estrella
    • http://files.arthousejava.com/uploads/1/3/2/6/132682745/wotulaloxabon.pdf
    • http://zekut.catalynics.com/uploads/1/3/1/4/131406665/sezuteda.pdf
    • http://gujiz.harrypottervet.com/uploads/1/3/2/7/132741154/ketiliduzoxivu.pdf
    • http://fiwokix.janpeterdegraaff.com/uploads/1/3/1/3/131381464/3050227.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2e92992d-2363-40e3-a9d3-3e20d855076a.filesusr.com/ugd/9ea91e_8ab8f15393f24a3d91ed629cb776f558.pdf?index=true
    • https://1b888170-316e-4307-95f4-f1a2be030852.filesusr.com/ugd/d78803_7be0fa8d68484c07a77808f732266edd.pdf?index=true
    • https://43e5dea6-ae17-4434-b44e-65ab209aeba8.filesusr.com/ugd/269bb8_37896631857a4496b992c8999531f120.pdf?index=true
    • https://7711510a-6509-4cf3-9094-262b572dd221.filesusr.com/ugd/e50c99_a194d1ed9b01462bb85f5f24c0680e7a.pdf?index=true
    • https://6c95d635-80f3-47bf-9730-4757e3dddf3a.filesusr.com/ugd/e50c99_13c7b874bb5e43b4a1733c90ba4271ef.pdf?index=true
    • https://8505a2c9-c8bd-4103-9df1-1adf75cc8c1d.filesusr.com/ugd/e2f197_9eaae8cb870c4741af74e80847bdb9b1.pdf?index=true
    • https://7383042f-8753-480a-9080-10c8338e86cf.filesusr.com/ugd/ac51ce_6092318aead84d07aab108c4011b5754.pdf?index=true
    • https://f911fba5-670c-4166-92f0-75410c76c863.filesusr.com/ugd/3e0cb9_62594387beb6436d927f0aab64f45b66.pdf?index=true
    • https://6421a191-797e-4f7e-9533-efa7e525a07f.filesusr.com/ugd/b0cb2d_9c4c57d5b6cd4318b94a65c6d2361a58.pdf?index=true
    • https://8537583e-b8cb-40c8-9d21-4e45fa63fd0b.filesusr.com/ugd/b98abb_905cde2655de4324ab6b5fd5a43d4717.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f72.bin
9ba2a5ebec58b329e8bd2db1f8a8b56845523f2533530d40b23dd3175eda5048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F72 5076 bytes
font_01_sfnt_off000070bd.bin
750f62a811f58fa915c44e2057d06305898882c1e5f7afe12e1521c215318007		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BD 9932 bytes

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