Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8ae1bdbd7f9057…

MALICIOUS

PDF

37.6 KB Created: 2020-08-14 03:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1576cf12a8a7b471f2fc5a89068e7480 SHA-1: 2796b778ee119af8aff8ccd515b77b6667a67a19 SHA-256: 3d8ae1bdbd7f90571e229f67402e529892c755098f467364cd0cb84f34928e9e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body text, though garbled, includes the string 'Venom movie songs' and a URL that matches the redirector, suggesting a lure to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=venom+movie+songs
    • http://files.stupindouscreations.com/uploads/1/3/1/3/131398351/sebovig.pdf
    • http://files.nhsofdav.com/uploads/1/3/2/7/132741110/fafusi_pekajebizefiwok_dozumilarovul_sekapowipop.pdf
    • http://files.tobaccobarnfarm.com/uploads/1/3/1/3/131380651/1408297.pdf
    • http://files.markdoodesplanning.co.uk/uploads/1/3/0/8/130813037/koburor_tafike_saminopubadema_nutot.pdf
    • http://files.thearconline.org/uploads/1/3/1/0/131071137/8755264.pdf
    • https://cdn.shopify.com/s/files/1/0430/6318/1473/files/pdf_to_word_converter_online_2pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/1691169443.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/gupifafive.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/77571139296.pdf
    • https://cdn.shopify.com/s/files/1/0431/8612/7009/files/javomuzejusuvikobazu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/28855165039.pdf
    • https://cdn.shopify.com/s/files/1/0436/3878/4158/files/90580453984.pdf
    • https://cdn.shopify.com/s/files/1/0429/2070/6204/files/ar_15_upper_assembly_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/raxerebipipitokubivezo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/franco_columbu_bodybuilder_s_nutrition_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/blank_dd214_form_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005720.bin
58a536e3ecf96c6da4e061f0fa6595c01dbd5999bc8dd1edd7567dd6a8f59c11
pdf-font-stream PDF embedded font (sfnt) at offset 0x5720 4692 bytes
font_01_sfnt_off0000671b.bin
9cfc7f7ba2c965de4a28c6c1ae0ee54ffdf02587e318108e6973efbe921452c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x671B 10204 bytes