Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c330dca8526cf5…

MALICIOUS

PDF

41.4 KB Created: 2020-10-13 04:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7dc4484086c1b5f8f710b524f765843f SHA-1: 9824e15b896c4314dae9c959d2cf7f15851d9f46 SHA-256: 49c330dca8526cf5b614511045bcc475f8940926953653b60ddf37a05fc94235
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the redirector. The PDF_SEO_LINK_FARM heuristic also indicates a large number of outbound links, suggesting a spam or phishing campaign. No scripts were extracted, but the presence of malicious links is sufficient evidence for the attack pattern.

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://cctraff.ru/strik?keyword=vw+golf+variant+preisliste+2020+pdf In PDF document text
    • https://site-1040437.mozfiles.com/files/1040437/pazupurasivemukefororikud.pdfIn PDF document text
    • https://site-1042602.mozfiles.com/files/1042602/42537234092.pdfIn PDF document text
    • https://site-1037005.mozfiles.com/files/1037005/xugip.pdfIn PDF document text
    • https://site-1039167.mozfiles.com/files/1039167/27887350739.pdfIn PDF document text
    • https://site-1036921.mozfiles.com/files/1036921/torexakipeki.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/1/0436/9186/8310/files/fevarivabakekebitumibilus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/7108/7007/files/hawaii_doe_calendar_2021-22.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/are_domestic_rabbits_rodents.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6068/6748/files/spongebob_tickler_apk.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_off00005dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD5 5600 bytes
SHA-256: d9161db807b11e3c6855194def460d3beec2a717f1b2f60d7a3004be9988d13e
font_01_sfnt_off00007116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7116 12672 bytes
SHA-256: 44e91aa3145d401bc42be1508e3fee62b3140789d812676ef00eb4f0e320b4e7

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