Malicious PDF — malware analysis report

Static analysis result for SHA-256 01534393aaba5c3b…

MALICIOUS

PDF

40.3 KB Created: 2020-08-08 07:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bfb62e042490c694881fe1c914226e1 SHA-1: c5b92bbbcef5e95238f526fed51bd5f3f2501740 SHA-256: 01534393aaba5c3b53e89fc0f3a5eb73d332538b425898cab0a6dd2abd0c9f1b
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO link farms and redirecting users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=libros+sobre+administracion+de+empresas+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise malicious activity as a search result. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=libros+sobre+administracion+de+empresas+pdf
    • http://files.vocations-sagesse.org/uploads/1/3/1/3/131380029/vavaguxuwuvi_juwakow_wopova_rikimanigikog.pdf
    • http://files.healthycleaningsolutions.com/uploads/1/3/1/4/131406365/kinupigebe.pdf
    • http://files.bishalini.com/uploads/1/3/1/4/131437864/50e4892d49d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4591/0678/files/gavofumijunog.pdf
    • https://cdn.shopify.com/s/files/1/0440/4484/5206/files/mp3_to_instrumental_converter.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8143/files/convert_pdf_into_word_ocr.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/jiwujejokojugogetogax.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/causes_and_prevention_of_diabetes.pdf
    • https://cdn.shopify.com/s/files/1/0438/8411/8184/files/97234792745.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1741436775.pdf
    • https://cdn.shopify.com/s/files/1/0433/4475/6901/files/99743147469.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2341/files/25837527174.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/jusimovutozimobebupabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9350/7737/files/94121342760.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_off00005cbc.bin
07da29f231dd9b9a2bc34efac8fc7054900512a882700280b2050f1653c2778e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBC 5348 bytes
font_01_sfnt_off00006ece.bin
8cfd1cebc2fd2fa3c257369d5e02cac247edb6ecb4552ad9c7c3d47aae8c8a4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECE 10900 bytes

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