Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e32717b109253e…

MALICIOUS

PDF

44.7 KB Created: 2020-10-01 12:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 502f30cc7399b20f66f5105407acc153 SHA-1: e0b5845a0d0e2855bc61d484f261efad6ec9fb29 SHA-256: 31e32717b109253ead6e82730d1fd36657ec7a6463da420b68afdff71d4320eb
154 Risk Score

Malware Insights

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

This PDF file contains a link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the target URL and appears to be a lure related to 'Riesgo reproductivo'. The PDF also contains a large number of external links, flagged by PDF_SEO_LINK_FARM, suggesting it's part of a link farm operation. The ML classifier strongly indicated 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=riesgo+reproductivo+definicion+pdf In PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/bijamekoxadaj.pdfIn PDF document text
    • https://site-1039970.mozfiles.com/files/1039970/34410280766.pdfIn PDF document text
    • https://site-1038690.mozfiles.com/files/1038690/62925151214.pdfIn PDF document text
    • http://files.patpetdingdongbelle.com/uploads/1/3/0/7/130776490/2eb8d6.pdfIn PDF document text
    • http://denon.fossilfreepcusablog.org/uploads/1/3/0/9/130969844/fiwogowomozo_naremovuzuki_netozovijonebip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7642/7686/files/wamunifodebuwoton.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3854/5819/files/apology_letter_format_for_student.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2477/9933/files/dutch_hollow_lake_wi_dnr.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gimuwuwizarisatin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/vuribuxogedamepomomoxej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7188586e-b3e4-4f3f-bdb3-9e01f2fb20ef/weruwenutakogela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b4c2245-3755-4723-bce7-154817f9c15b/xomewazowivimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b560b10-9620-4747-bc0c-240e9fe94e10/fobobagumejefal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6abc8c-c045-4b4c-affe-1dc66bb7ab1d/54162995055.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_off00006189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6189 5028 bytes
SHA-256: 6b4e1dc1f882d2771d826e9683bc68938651a22e15638b9a82851a1b4f78f4cf
font_01_sfnt_off000072c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72C2 10792 bytes
SHA-256: 590bb6915fd283bbc9f8dd5a6a7727caf33167d5bf98b43bcb085fd1bae6f6e1
font_02_sfnt_off00009607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9607 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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