Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46a4b83c224e8d5…

MALICIOUS

PDF

60.7 KB Created: 2020-10-01 08:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 98d601b658cdb24b7ebae5944a54fd4b SHA-1: 3be654f0142b5b0314275f78b4f4df1d3acc6c02 SHA-256: a46a4b83c224e8d5846f06b2271d0fe8288883e1d438bbdf4daa31d72207bf5b
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs, suggesting a link farm or redirection strategy. One prominent URL, 'https://ggtraff.ru/strik?keyword=low+back+pain+physiotherapy+exercises+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL, reinforcing the lure.

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=low+back+pain+physiotherapy+exercises+pdf In PDF document text
    • https://site-1036633.mozfiles.com/files/1036633/kuxixoriremulomunamexawex.pdfIn PDF document text
    • https://site-1037238.mozfiles.com/files/1037238/59890874740.pdfIn PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/64941364469.pdfIn PDF document text
    • https://site-1037028.mozfiles.com/files/1037028/jazezijomevosezuvorufoda.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/gobatatulogiku.pdfIn PDF document text
    • http://files.serenitycounseling-wellness.com/uploads/1/3/1/4/131452870/fiwuparunofevif-nizenawuzogip-tifamulujunuji-mevekejasobeke.pdfIn PDF document text
    • http://files.chantalletodd.com/uploads/1/3/1/6/131637240/63ff1ee8b678.pdfIn PDF document text
    • http://gatakoti.tangerinetales.com/uploads/1/3/1/3/131397997/gezonunabojojot-wonemogo-vexatulo-mifibinalokezo.pdfIn PDF document text
    • http://betireg.devonnaturegarden.co.uk/uploads/1/3/1/3/131379591/ed0617eb26ca.pdfIn PDF document text
    • http://files.bjs-cleaningspecialists.com/uploads/1/3/1/0/131070560/3295548.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/1/0429/0586/2307/files/gadusokij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/tafinawazitofijeru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/bebatikoreboboxuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/13775336530.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/55964979514.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/xejabutilavuki.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_off0000a8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8EE 5616 bytes
SHA-256: 0b07fe381df973e42de68eb8ea14b305cbab9a75f930ef32dc5ca41a6afb4c65
font_01_sfnt_off0000bc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1B 13172 bytes
SHA-256: a110b3766d60b7590084b53f866c12822811c8799b700c98090809bb2f816196

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