Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d350a444a7ea87…

MALICIOUS

PDF

50.8 KB Created: 2020-10-12 05:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: caa7cdf4cb1c060a309270ba3b1e5cb5 SHA-1: fca61865bea2ff1d7b77b7f76d97b88f0503b655 SHA-256: a5d350a444a7ea87c7a879771c94fab7be2eed241260bd4c0bc70dea630fb771
154 Risk Score

Malware Insights

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

This PDF document contains numerous links, masquerading as search results for "Bob Dylan chronicles volume 2", that point to a known malicious redirector. The document body itself is heavily obfuscated but contains the malicious URL and several benign-looking PDF links, likely part of a link farm to improve SEO for the malicious content. The ML classifier strongly indicates maliciousness.

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=bob+dylan+chronicles+volume+2 In PDF document text
    • http://zogamo.woolercameraclub.org/uploads/1/3/0/7/130775172/nuvaj.pdfIn PDF document text
    • http://files.reisrenditions.com/uploads/1/3/0/7/130739028/mivurulup.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/1/0435/1141/4943/files/pofebed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3295/1446/files/lutiwekefofupolo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4701/3530/files/83887181375.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/54362714234.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9129/6413/files/tommee_tippee_steam_steriliser_instructions_how_much_water.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2600/1315/files/wivuwapizirotutoxiwegubu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3098/2041/files/titulo_de_credito_ejemplo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5296/3742/files/45001032704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4312/2071/files/voludoxenuwamagiwuritubog.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_off000088f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F2 5664 bytes
SHA-256: a3af5e881a38403ea81335e363d02515a9fcf060b39904635ed6adc5253c7a13
font_01_sfnt_off00009c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0E 10060 bytes
SHA-256: 3702bf8dc93a9bc3d10fe38ed093cbdfb9ab3fe06ff9e54613bbd9423bfb498b

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