Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcd540347e3ee73…

MALICIOUS

PDF

44.2 KB Created: 2020-10-08 14:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6e24de6d8a833ea8913e8f4d7b8be5b1 SHA-1: e844cc74f9ac546e0e1b275d8218d64f4f090e97 SHA-256: 2bcd540347e3ee73db5e8019d49111d8b9fafcc80c0439197a2bbf57c0946593
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links disguised as a converter tool, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'pdf to excel converter' and a URL that matches the malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of 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 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/strik?keyword=pdf+to+excel+converter+online+500+pages+in+one+sheet In PDF document text
    • http://ruwib.stemedacademy.com/uploads/1/3/1/3/131380908/9824875.pdfIn PDF document text
    • http://tatoluvun.jasonjenningsvideo.com/uploads/1/3/0/7/130776702/kebegobomag_fimoxoxawadi_parusakowe_wigatuvo.pdfIn PDF document text
    • http://xebimo.improvenutrition.co.uk/uploads/1/3/0/8/130873930/1953313.pdfIn PDF document text
    • http://fugurij.jamesbrearley.com/uploads/1/3/2/8/132814930/simuzuzekafutun_zuwuvinutuv_kebeduk.pdfIn PDF document text
    • https://site-1037074.mozfiles.com/files/1037074/91550588944.pdfIn PDF document text
    • https://site-1041695.mozfiles.com/files/1041695/13106171156.pdfIn PDF document text
    • https://site-1042604.mozfiles.com/files/1042604/tuxelolem.pdfIn PDF document text
    • https://site-1039748.mozfiles.com/files/1039748/28784378164.pdfIn PDF document text
    • https://site-1037044.mozfiles.com/files/1037044/22803617695.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4180a979-9ee7-47c9-83f1-a19e4b284854/migokobogujamezuxofol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70103515-2ff4-4920-ac7b-a05406c75ac4/23603533762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828872a5-9f5a-4e35-9dcf-f0418aa59ced/tobiluvegusumajale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3242af7a-a78e-42c4-b612-e1680ed3918e/rowizibodasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7670/5690/files/11090767518.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7898/7165/files/xebalakurilixabudikaged.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3274/6906/files/mekifevaziken.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6146 3396 bytes
SHA-256: 019ae317c1ae45cf80e7afb453b05714fcc380a874e5f543d71113ea1553695c
font_01_sfnt_off00006d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6D 5812 bytes
SHA-256: 00530adaf1294fcdc51eaf948c7ca57f8cc86cef3d1f29d98bcd5226d5d32eae
font_02_sfnt_off00008142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8142 9844 bytes
SHA-256: f4a2bf162146659b53a6711ed4427584df4cc721256c8f10826d29f5d77ac4ce

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