Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e4dba26f6deadc…

MALICIOUS

PDF

42.3 KB Created: 2020-08-27 19:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6512c464b6f0ff727b354b5c60ab2cf9 SHA-1: 336f22fa3a7dc5076cd21b33b0e0f3d5802fa884 SHA-256: 05e4dba26f6deadc9149acd4de2d3444d344bf4cb518c1b38979620988ae6467
154 Risk Score

Malware Insights

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

The PDF contains a deceptive lure related to a flute serial number, which redirects to a malicious link farm. This infrastructure is designed to host numerous other PDFs, likely as part of a SEO poisoning or link farm attack. The presence of embedded links and the ML classifier's high confidence indicate malicious intent.

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.link/pify?keyword=armstrong+elkhart+flute+serial+numbe In PDF document text
    • http://files.freestatek9.com/uploads/1/3/0/8/130874050/246261.pdfIn PDF document text
    • http://files.adamsteinbachonline.com/uploads/1/3/0/7/130738889/wofopalufab_ralazonazipev_nototudefo.pdfIn PDF document text
    • http://files.birdsofpreytexas.org/uploads/1/3/0/8/130874554/8a7f49bec.pdfIn PDF document text
    • http://files.thedarkobsidian.com/uploads/1/3/0/7/130739430/xekugipawigopajuzu.pdfIn PDF document text
    • http://disanidis.chapel-associates.co.uk/uploads/1/3/1/3/131383544/637446.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5502/1223/files/arabic_keyboard_for_iphone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4204/6103/files/nimobuwogijupuja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4024/1829/files/sozozebonoxuba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/namamij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/93200042081.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8392/2585/files/cu_sch_thi_bnh.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/avancemos_2_workbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/20589101562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/xorexamotuxuvuduza.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_off000063a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A4 5376 bytes
SHA-256: 2b3eee582b7a52b854fcfec87e272e8283f9963f0e602c895ade422b5883fdda
font_01_sfnt_off000075c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C2 11508 bytes
SHA-256: 1ea15db3d1e52cc2f1f11b7f68a7e42f3f51bd01105a33272739b4cf893e97e5

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