Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58bf92d82b5e3a1…

MALICIOUS

PDF

42.6 KB Created: 2020-11-05 15:35:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa9396ba89086aeb1486443524fd82e5 SHA-1: 1a6a7df4c078fd9ded1390d6b4dac26990977dd4 SHA-256: c58bf92d82b5e3a125d0c03a4eb11de8c6246236d08c83c4290fdb3627dc360f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, with a specific heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of these links, 'https://trafftec.ru/aws?keyword=drawn+to+life+walt+stanchfield+pdf', is directly embedded in the document body. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?keyword=drawn+to+life+walt+stanchfield+pdf
    • https://cdn-cms.f-static.net/uploads/4373511/normal_5fa321ecc5683.pdf
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/dfa491084eb3.pdf
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/8621564.pdf
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/1557601.pdf
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/ladowelujiwu.pdf
    • https://naxufubiromu.weebly.com/uploads/1/3/0/7/130738890/3792489.pdf
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5f9913d8cb58d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6433331-3703-4dce-a7af-9d314eb4460b/zapya_apk_pc.pdf
    • https://uploads.strikinglycdn.com/files/01d9c322-52d3-419c-9ca7-5c048cbcad1a/dirujipiwisepewutotopep.pdf
    • https://uploads.strikinglycdn.com/files/cbb0ec78-9ab7-4b1c-bcbf-a5c18cfba27e/mirekefuxokikudaxosuvuro.pdf
    • https://uploads.strikinglycdn.com/files/287927cf-9f82-4c7a-b2f0-1b135bce0372/2508549538.pdf
    • https://s3.amazonaws.com/pazifetanegapu/digestive_system_test_questions.pdf
    • https://s3.amazonaws.com/rotowan/71276058596.pdf
    • https://uploads.strikinglycdn.com/files/631a3474-1d5e-4337-ba21-1dc0c10de9fd/97441800804.pdf
    • https://uploads.strikinglycdn.com/files/00ac5a60-a819-4968-9c7d-7894a116707a/japan_information_policy.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006907.bin
24ebe99ee1ac3ab2605446fed13f47928f8c766c90ec3f0976af4eea28b64a00
pdf-font-stream PDF embedded font (sfnt) at offset 0x6907 5336 bytes
font_01_sfnt_off00007b3d.bin
01b1aba731c2e019061ad8709a48a2352360d258150b51324fcebe6059eae7b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3D 9848 bytes