Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3585b3ca4e471c…

MALICIOUS

PDF

53.7 KB Created: 2020-08-12 20:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a0c8320ac4ca88ad1d42fa220aeb97f SHA-1: e2f1b70c7510bb571e1f9b9304fa7e7f3d1805d5 SHA-256: 3a3585b3ca4e471c75a57c653ef1b5b7c7881ca27751aa4fd97ec1b1d010c511
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL designed to lure users with a search query. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting the primary purpose is to drive traffic to this redirector.

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=abraham+maslow+pyramid+pdf
    • http://lugosik.ciminerabooks.com/uploads/1/3/0/7/130775934/76a30ce0.pdf
    • http://files.hospitalinfrabiz.com/uploads/1/3/1/4/131409677/kixigijib.pdf
    • http://punof.peacemusic.net/uploads/1/3/0/8/130814328/muxosa_zinari_xupazixuluvib.pdf
    • https://cdn.shopify.com/s/files/1/0439/4260/9051/files/15101802428.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/jefatevulemalizurubanetuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/51600971665.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/jatoxatimufomem.pdf
    • https://cdn.shopify.com/s/files/1/0429/5399/8487/files/nz_shooter_manifesto_full_text.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9143/files/dipep.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/julius_caesar_study_guide_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/5362/8062/files/fululofidoma.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/gatuparajovabiko.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009333.bin
fd176b9f481dd466a732b876f06167c4d5da90d2a493c0c237f1ab5269eff98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9333 5604 bytes
font_01_sfnt_off0000a623.bin
b017a1ae9b023f6997bb65f09f5d89b00b0a14ab64032877bba5748bf543fdc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA623 10452 bytes

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