Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2cdfdbf7917b38…

MALICIOUS

PDF

62.1 KB Created: 2020-10-14 20:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44d7dd8712695958987d888b195f5188 SHA-1: 1d37482050af195340a0f954051749e692e8800c SHA-256: 4b2cdfdbf7917b386157ee1a5621ad295c884a30cc9c75940fc9a84738440530
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to other PDF documents, a technique often used for SEO poisoning or to redirect users to malicious content. The primary link identified, 'https://gettraff.ru/strik?keyword=farmacos+antagonistas+adrenergicos+pdf', is flagged as a known malicious redirector. While no scripts were extracted, the PDF structure itself facilitates the malicious redirection.

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://gettraff.ru/strik?keyword=farmacos+antagonistas+adrenergicos+pdf
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f870db5235ea.pdf
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f872921425e9.pdf
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f8708ad5ac00.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/83905a54a030772.pdf
    • https://jiwadurator.weebly.com/uploads/1/3/0/7/130776405/d357973b93c.pdf
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f86f865dc8cb.pdf
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f86f6bc8f065.pdf
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f8721e772c67.pdf
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f870299156a8.pdf
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/edbd2edb1a75.pdf
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/c8a1498.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0479/3597/9676/files/xodevitejida.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1585/files/crescent_moon_herbals.pdf
    • https://uploads.strikinglycdn.com/files/9c422d96-f0a9-4f5a-8088-50af736ad4ab/rulipobawutoporefudijen.pdf
    • https://uploads.strikinglycdn.com/files/94d7a1ac-a4a6-45a7-98d1-e61fd59f54e8/83344188093.pdf
    • https://uploads.strikinglycdn.com/files/25855072-f202-4732-b656-50635b7c45cc/9972303981.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009046.bin
37c24baa18d0073ec8030c3588704cc78396206b8b2b974af8757a8904f74525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9046 1644 bytes
font_01_sfnt_off00009881.bin
0f57a2f1a0ea3b95dbdb5f8c8816825ab90d61d3698d8cfa8ce02435b032459d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9881 5184 bytes
font_02_sfnt_off0000aa06.bin
6a649bda889dbdac8eab0057007441bced90c6ecb997c62e0f5d35486006f6a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA06 16280 bytes
font_03_sfnt_off0000db34.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 4324 bytes

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