Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c70a854a7149d5…

MALICIOUS

PDF

40.7 KB Created: 2020-09-16 15:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c04d47dc5db57f4d75df85b54ab833f SHA-1: d5398ab34d5b8436872d8bff4321b5d54c5d87d9 SHA-256: 93c70a854a7149d59f847b53c5ffd846295c76ced31afba0e4918851626d09e3
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, and another detected a large PDF link farm. The document body, though heavily obfuscated, contains URLs that are consistent with this behavior. The primary malicious URL identified is https://ttraff.me/wix?keyword=guiones+radiofonicos+de+culturas.

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.me/wix?keyword=guiones+radiofonicos+de+culturas
    • https://2da9dcb8-9e6e-4622-898c-105837280
    • https://25139b70-d51c-4ed8-accb-96d8f7420378.filesusr.com/ugd/035627_de756fd1a33e48cd82c7515cbf32dd2b.pdf?index=true
    • https://bc0506f4-3393-4da9-861b-11bd7c52a2e0.filesusr.com/ugd/ffcbea_b63c4ef6aa7845f6b392f5ea3e739c3f.pdf?index=true
    • https://6e8c98c5-66cb-4079-b96d-4fb05596901a.filesusr.com/ugd/0049ca_29d3091e193247dba2ee65ea7e017278.pdf?index=true
    • https://13ae3428-3523-4c0b-93c4-63dbc22d0b4a.filesusr.com/ugd/3ed902_a809a382fdff40ee9651d1f1d8dea957.pdf?index=true
    • https://ec8c1ecb-4c87-4807-b1dd-65a90b869df1.filesusr.com/ugd/89064d_10709abdd53f4e83b4b3013590ee4609.pdf?index=true
    • https://eb2fc0e5-3c72-428f-83ee-ac0caced3a8e.filesusr.com/ugd/221eaa_27d16db956b44ac09766a7b851e9a66b.pdf?index=true
    • https://216232e6-ac03-4df8-b156-2381d8ed426a.filesusr.com/ugd/2e16aa_6bb5a0cdd7a14f98bdf0cf4f56eb1a6b.pdf?index=true
    • https://24ac7bda-d1f2-434a-80c0-ca21cf728636.filesusr.com/ugd/bba345_e41ea0bfa1cd41558b423488ab78d44b.pdf?index=true
    • https://21463815-4d36-4cf5-b539-f89d05ddddf8.filesusr.com/ugd/8bf3fc_1e1fb8f14aa2494e9dec826069cf135b.pdf?index=true
    • https://e420843c-8515-4cc4-80a9-8ed1b1ff989a.filesusr.com/ugd/dcc11b_0973720a97044c98b892c00aff12fbf3.pdf?index=true
    • https://d488eb2b-f3c2-4695-87fd-5d414ec33efd.filesusr.com/ugd/54bec1_875186b0ecd34c4c9faeb176f02cc50d.pdf?index=true
    • https://b4e231aa-2c39-4620-af95-6be271367ced.filesusr.com/ugd/314c35_d6603e80da304d7da47cc1029d8b6d9c.pdf?index=true
    • https://0dcb09c7-f462-48d5-9eb8-e8d3186a7fac.filesusr.com/ugd/ed2d23_063a4d081217429e9b17c2e3528a1850.pdf?index=true
    • https://01179b4d-3fe3-4b7f-806f-10c0e31e8b4f.filesusr.com/ugd/d6af85_4ee0c1c2a27a49208b6c7784b392f2b2.pdf?index=true
    • https://2da9dcb8-9e6e-4622-898c-105837280d26.filesusr.com/ugd/9ea91e_8076590b78cc4ca3a9493a086043b0a6.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e9b.bin
420059f64e173dfdd11ab7fc88463aa9890b8abbcbc55da6feee559082643b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9B 5044 bytes
font_01_sfnt_off00006fd3.bin
6900a4e785e7dc20001b5fb2e8602c750e24a9ba56b51baca22a42c8da507131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD3 11228 bytes

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