Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2df3dedb6e759af…

MALICIOUS

PDF

44.5 KB Created: 2020-10-02 08:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ae0fb6fd983e97388779415eb1718ab4 SHA-1: b7249966085fd2eb37f9ca119f0b6e1d413ee13e SHA-256: c2df3dedb6e759af9ca11bffb766fbcfa9ff44663a2dc77e77be3b9ff82cc1dd
162 Risk Score

Malware Insights

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

This PDF document contains a link farm and a malicious redirector URL, indicating it is designed to lead users to harmful content. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a lure to download further malicious content or engage in SEO-based spam. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ggtraff.ru/strik?keyword=jolly+phonics+workbook+4+pdf In PDF document text
    • https://site-1037184.mozfiles.com/files/1037184/3902398189.pdfIn PDF document text
    • https://site-1041207.mozfiles.com/files/1041207/34946283397.pdfIn PDF document text
    • https://site-1038967.mozfiles.com/files/1038967/rujotejabaveni.pdfIn PDF document text
    • http://lutudisu.arieldetwiler.com/uploads/1/3/0/9/130969077/b65e9fe7e.pdfIn PDF document text
    • http://kujop.concertforacure.org/uploads/1/3/0/8/130874473/limopefizelure_mikulebedumodin.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/781d5227-e893-44de-8b43-2df1ae448293/65222963008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e15a6f-d608-45dc-8024-0bbf60ef4563/33783879020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1661aa27-ba24-4cf3-a7e8-f707c3db139c/zesofolasofutif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f19930-f971-4f02-804a-60924720d763/60861960944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d812537-1d1a-4430-bdd2-50e36b6575e6/vukigufopesukume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3368/0282/files/kunuzikovibodafepok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/23989711736.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2071/6701/files/jigetaregemif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5793/3219/files/petajev.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_off00006b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B72 5508 bytes
SHA-256: eb353aa9bf8efa77357a15c47c261fe410e541f7537f5facac3e865011f42b78
font_01_sfnt_off00007e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E45 11424 bytes
SHA-256: 34b6e74223351f5d6ef6476d35bed4ce9590fdf52e7e0b69ccfb84c3f13205e3

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