Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a822cc1fec149f7…

MALICIOUS

PDF

74.9 KB Created: 2020-10-05 03:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aa320a683ec77ee4d2b49649e76c533a SHA-1: db064cb7e0eaea3fcd30e10352b8cf04ab5913e9 SHA-256: 2a822cc1fec149f701682f95f5c61cd5405d5cb351224088731e178636087bc8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics as a malicious redirector. The ML classifier strongly indicates maliciousness, and the PDF structure suggests an attempt to manipulate search engine results or distribute further malicious content.

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://ttraff.link/pify?keyword=jds+labs+element+vs+element+ii In PDF document text
    • http://files.miryanapro.com/uploads/1/3/1/1/131164153/tikeniwitatugi.pdfIn PDF document text
    • http://files.ltpasolution.com/uploads/1/3/1/4/131438843/jizukajitowinuvabe.pdfIn PDF document text
    • http://files.coreywalkermaine.com/uploads/1/3/1/1/131163943/59bd9536ed04.pdfIn PDF document text
    • http://milafof.westsideuta.org/uploads/1/3/2/6/132680835/7733232.pdfIn PDF document text
    • http://files.roligiogroup.com/uploads/1/3/1/4/131438490/1366602.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/1/0430/3798/2869/files/19034833147.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2289/5272/files/kadisitamakaru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0900/5989/files/minnie_mouse_fabric_mask.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/0843/8684/files/turinomor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1913/6935/files/27493609381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad1bfcf3-90aa-4fa5-8068-57f93aeadda9/pewode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b60475-1b9f-4042-b188-d59bb7cfd558/60972813156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1a1e5a-d04b-4dbd-b872-0587477fd079/68848040794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a48b0b-e401-41af-88d9-ad0f7dec2c56/pimefapiwakirorikuzosuvis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b74ef2-2d03-4dee-a137-1965bb469841/5199587616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44394aa8-ad3e-41ef-b1cb-15f5ca8b4346/begivuver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2517bec-8327-4811-a182-0dfc97fd5a9b/47058371830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/523d2c4c-8ce2-41dd-82ba-cb85a13d95ab/gopifekopo.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_off0000e71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 5064 bytes
SHA-256: 4417e311a153798990f0ae14489e6721f0ed9a083444373271507055fb5f9e58
font_01_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 11192 bytes
SHA-256: f39e0a56a5abc398d49fe948cc57a2abc6d2a5da88e8b9b5fd1648012c171de5

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