Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b316604e0bff0b…

MALICIOUS

PDF

36.9 KB Created: 2020-11-06 03:35:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e5d91b268313cacc9d6d1692ca4a891 SHA-1: 7838443d00489222f53d1eb208186ca19c95cd61 SHA-256: a5b316604e0bff0bdf6480672e299b26b00091c75588df4446d2ca2d8553cb29
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to Weebly and Strikingly hosted PDF files, suggesting a link farm or SEO manipulation tactic. The primary external URI, 'https://traffset.ru/123?keyword=youtube+dr+mrs+vandertramp+song', is likely intended to drive traffic to a malicious or deceptive website. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of malicious intent.

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://traffset.ru/123?keyword=youtube+dr+mrs+vandertramp+song
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5f90ad9ecd594.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/kejufemuxodufinox.pdf
    • https://cdn-cms.f-static.net/uploads/4405654/normal_5fa3438713406.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/6aa031573010f78.pdf
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/voreduxa.pdf
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f9099ea7a69c.pdf
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f88589260686.pdf
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/xananovetivagizaxa.pdf
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/63d8addbf5c776.pdf
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f87402f246be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f2b4bf61-f120-4d04-a2a5-23700e34993b/raluf.pdf
    • https://uploads.strikinglycdn.com/files/5025bc1b-f4aa-414a-8c48-7277a506d467/65158928967.pdf
    • https://uploads.strikinglycdn.com/files/060b963b-74aa-4163-9b81-178d7adff423/89709099867.pdf
    • https://uploads.strikinglycdn.com/files/df75602a-d2d9-4da1-aead-29d69c980a66/114744337.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_off0000504c.bin
a2d06657ee1498127c8be82286f6b08a3d5f31e3a3d55fb4902326615285671b
pdf-font-stream PDF embedded font (sfnt) at offset 0x504C 5408 bytes
font_01_sfnt_off0000629d.bin
d8d3533f8bad6ab8ac5c5328df8efb18c1e727a51e186e60e85e032e478111c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x629D 11392 bytes