Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc235a15e3c17cc…

MALICIOUS

PDF

44.1 KB Created: 2020-08-17 14:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f643ab756d9f80d31493a8283645324 SHA-1: 1461f79f05c8b293530626ef246f79d0d47f8b27 SHA-256: 4dc235a15e3c17cc9b8f755c163eb06b3fa19d58e91e3d908a79383cc350f671
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). The document body, though partially corrupted, contains the text 'Twin bed sheet size in inches' and the malicious URL, suggesting a lure to disguise the malicious redirection. 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.cc/pify?keyword=twin+bed+sheet+size+in+inches
    • http://xofev.bradylarsonart.com/uploads/1/3/1/6/131607240/tifure.pdf
    • http://files.audreawinbushlott.com/uploads/1/3/0/7/130776406/9222538.pdf
    • http://fopevef.photographyjg.com/uploads/1/3/0/7/130776394/6268755.pdf
    • http://files.gotstrings.org/uploads/1/3/2/3/132303382/zuvigapi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4925/4048/files/losufuzopamal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/febipak.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/zonalokubepabujevi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1779/7785/files/ceratoconjuntivite_seca_em_ces.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/xuditapefusarosuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7704/2325/files/29831793174.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/business_value_proposition_canvas.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/cartan_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0434/4446/9927/files/autocad_plant_3d_2017._1_update.pdf
    • https://cdn.shopify.com/s/files/1/0429/9259/9193/files/5664725099.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/37925547895.pdf
    • https://cdn.shopify.com/s/files/1/0440/7925/1608/files/26260226667.pdf
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/vitapabitot.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/bozifim.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_off00006f37.bin
8c56c794a9e62ca022966414d4cfe8fa889376c299cd33cb653b52fc99001a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F37 4920 bytes
font_01_sfnt_off00008000.bin
667c0656965c6609c2c19ff92786ed74875b58ab0839322bc7fcd7d465346314		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8000 10400 bytes

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