Malicious PDF — malware analysis report

Static analysis result for SHA-256 837b89b788350cdf…

MALICIOUS

PDF

40.4 KB Created: 2020-10-03 22:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 749a7d883b7bca5bf79664262d45193c SHA-1: fdf753939e73f29413658b70c2c0770c4bb440eb SHA-256: 837b89b788350cdfd1a9aacd42e4f83f668dfdc452cf0535c5c71236f9060fe1
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though obfuscated, contains the target URL and keywords suggesting a lure related to financial information. The ML classifier strongly flagged this PDF as malicious, indicating a high probability 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://cctraff.ru/strik?keyword=dividends+receivable+on+balance+sheet In PDF document text
    • https://site-1036876.mozfiles.com/files/1036876/30537015688.pdfIn PDF document text
    • https://site-1036803.mozfiles.com/files/1036803/fagipudevufiluniju.pdfIn PDF document text
    • https://site-1039608.mozfiles.com/files/1039608/biberoxagetezugan.pdfIn PDF document text
    • http://wovepobep.ekalosangeles.com/uploads/1/3/1/3/131380908/kapegizovobu_vopasuz_dorubujudevaja_dobeluzitajexoz.pdfIn PDF document text
    • http://files.trulloneglialberi.com/uploads/1/3/1/3/131380086/suroxuvefakix-kelibixuluneb-sotela-wapevojo.pdfIn PDF document text
    • http://farakiz.csyogaconnect.com/uploads/1/3/1/4/131437622/e33f7c.pdfIn PDF document text
    • http://files.100waystolisten.com/uploads/1/3/0/9/130969311/pamexatul.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/1/0429/0743/5167/files/evil_operator_apk_not_working.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2153/5912/files/53859794454.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1954/1416/files/winabudazoladugovififaku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8152/6176/files/cytochrome_c_comparison_lab_answer_key.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_off00006010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6010 5224 bytes
SHA-256: cede8e50195ffba1269a40cccfb19235cedfebba55176faeb4c2d582ed9c23b6
font_01_sfnt_off000071d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71D2 10336 bytes
SHA-256: 3079e762905c12ec6ed8a1928aa7a1d2ab2de5f251458ab9410a9b33ba851803

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