Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44fbf0d19426849…

MALICIOUS

PDF

42.6 KB Created: 2020-10-05 03:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4c6cfe2bbfdd246b2ebcb780e4701480 SHA-1: 675cf5f29f4d92de2061711e1f550342c7520895 SHA-256: e44fbf0d19426849ffdc889ef61d5cc1fb6fb64185e928e1fa592eace664ebdc
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominently leading to a known malicious redirector infrastructure. The document body, though partially obfuscated, includes the same URL and a reference to 'drawing on the left side of the brain exercises', suggesting a lure. The presence of numerous other PDF links, many pointing to Shopify domains, indicates a potential link farm or SEO manipulation tactic to disguise the malicious intent. No scripts were extracted, but the primary malicious activity observed is the redirection to a harmful URL.

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://ggtraff.ru/strik?keyword=drawing+on+the+left+side+of+the+brain+exercises In PDF document text
    • https://site-1036917.mozfiles.com/files/1036917/54514875202.pdfIn PDF document text
    • https://site-1037169.mozfiles.com/files/1037169/80541804655.pdfIn PDF document text
    • https://site-1038622.mozfiles.com/files/1038622/58592862433.pdfIn PDF document text
    • https://site-1037869.mozfiles.com/files/1037869/14492253265.pdfIn PDF document text
    • https://site-1036962.mozfiles.com/files/1036962/90788852086.pdfIn PDF document text
    • https://site-1038835.mozfiles.com/files/1038835/27159974936.pdfIn PDF document text
    • http://files.unitedchurchofgenoa.com/uploads/1/3/1/1/131163620/ca2562.pdfIn PDF document text
    • http://vimirorum.texomafurniture.com/uploads/1/3/0/7/130739377/gosije_kuxokigifadeza.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/1/0433/1202/1662/files/gildan_activewear_srl_rn_93846_ca_25181.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/x_reader_lemon_camera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6408/0024/files/56026797689.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4774/6726/files/college_essay_guy_personal_statement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1006/0196/files/missouri_educator_gateway_assessment_passing_score.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_off000067cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67CC 5584 bytes
SHA-256: 242b2fc3a1ac5f968e45b55331f0edecdf892e4011335bbef97f0aa8c184fecc
font_01_sfnt_off00007ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE6 10112 bytes
SHA-256: 11b4c5118acc1520abef9eea577c36e626178e9ba2e0057b6b383aff03884175

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