Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7ab3056735eeca…

MALICIOUS

PDF

46.6 KB Created: 2020-11-01 05:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 039a51853877722ad70029e458e4f2f0 SHA-1: c63bf6ebb63dbfbc6289e979004103e3a5aee7bc SHA-256: aa7ab3056735eecacb56acffec4ab5a0c9a213002b16b931e8411a9ae1fa1e79
184 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The primary malicious link identified is https://gettraff.ru/123?keyword=download+novel+silence+pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URLs, suggesting an attempt to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

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://gettraff.ru/123?keyword=download+novel+silence+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_5f8bc5807b2b3.pdfIn PDF document text
    • https://zejibafubetu.weebly.com/uploads/1/3/4/1/134108860/4d2de48.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/nipos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5f87f31f13ef0.pdfIn PDF document text
    • https://nofizosol.weebly.com/uploads/1/3/4/5/134500220/bisexerataj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5f9df9432922c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f873a4f603dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f8f92c6a1916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f874337bcb62.pdfIn PDF document text
    • https://lozagazol.weebly.com/uploads/1/3/4/2/134266804/aed4cf0a74.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/9979808.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/activated_carbon_preparation_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/buccal_fat_pad_anatomy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3071/6314/files/xesebubobokugodiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5086/6590/files/bodef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1117/3275/files/save_text_messages_from_android_to_iphone.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77AF 5204 bytes
SHA-256: e97c67b0f53da9da335652c8f6b30f3c7b72c945206aabd5b3d45a6e4c7d8c84
font_01_sfnt_off0000899e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x899E 10508 bytes
SHA-256: 7988ca5ee4bf77553323131fcb960373f543143be043202783f307fac6a7baf0

Open this report in the interactive analyzer, or submit your own file for analysis.