Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33ae64fdf364536…

MALICIOUS

PDF

46.3 KB Created: 2020-09-01 22:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0594128c4becda312abced5a00c62c7 SHA-1: 0c2a3d00b16733062e0b0be13896e8fc7b3c22e3 SHA-256: e33ae64fdf364536d9009818e4d421ec09f91ca9f93f6af4eb84306274509030
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which, https://ttraff.ru/wix?keyword=home+construction+budget+sheet, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to lure the user to this malicious site. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. No scripts were extracted from this sample.

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.ru/wix?keyword=home+construction+budget+sheet
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/37053940195.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/kamanepi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0610/files/56633742362.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/zewisez.pdf
    • https://cdn.shopify.com/s/files/1/0440/2796/9686/files/konerirox.pdf
    • https://cdn.shopify.com/s/files/1/0437/6572/7384/files/kizirabukenodaja.pdf
    • https://cdn.shopify.com/s/files/1/0441/0084/5720/files/tipos_de_empresas_segun_su_actividad_economica.pdf
    • https://cdn.shopify.com/s/files/1/0436/6771/8309/files/41559580837.pdf
    • https://cdn.shopify.com/s/files/1/0457/3954/0636/files/stoichiometry_study_guide_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/givibafa.pdf
    • https://static.usrfiles.com/ugd/b8c837_9acc212e5ff740a98d511d212432a204.pdf
    • https://static.usrfiles.com/ugd/b4609a_75b580a445dd40149773e1a3ae1a5484.pdf
    • https://static.usrfiles.com/ugd/4117a9_95828bbc8ee147ee8628435fff38160c.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000692c.bin
df90c2a0dc1ef8ee1a1985a3e25fde6f0620b2d396dd684038bc7f2d850b7649
pdf-font-stream PDF embedded font (sfnt) at offset 0x692C 5092 bytes
font_01_sfnt_off00007a43.bin
138a446f81b5a769acb20ccacb55ade07f922cf83705a7b113b38796a6a04c26
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A43 10652 bytes
font_02_sfnt_off00009ea5.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA5 4324 bytes