Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c95aabb2cbf5059…

MALICIOUS

PDF

37.8 KB Created: 2020-08-05 11:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcac46ed2fbafe0f14959ceced743a85 SHA-1: fe36c325aeaf5919ffc7f87235961a9d13b6f0b3 SHA-256: 4c95aabb2cbf50593d30cb653b4dd310df9bfd17b1ec50eb19659eff310c2f42
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which points to 'https://ttraff.cc/pify?keyword=simple+addition+word+problems+pdf'. This URL is designed to redirect users to potentially harmful content. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify-hosted files, suggesting an attempt to obscure the malicious destination or leverage legitimate platforms for distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=simple+addition+word+problems+pdf
    • http://files.olivetcongregational.org/uploads/1/3/0/7/130775432/1bedeffed4f4.pdf
    • http://files.celiamoore.com/uploads/1/3/2/6/132681985/3421801.pdf
    • http://files.livewellbuddha.com/uploads/1/3/0/8/130874588/tiderefurumago_gejiwisifizo_xaduwawizuluf_vafipopelifuwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/tijeti.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.pdf
    • https://cdn.shopify.com/s/files/1/0431/2465/4241/files/gagarajok.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/pabadojig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/sutova.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/19044869130.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/tikov.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/air_pollution_essay_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikakaxudote.pdf
    • https://cdn.shopify.com/s/files/1/0449/5812/2139/files/cub_scout_wolf_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/html_document_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/76756004097.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/ruwizetisegi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/jibekuzitamo.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_off0000563e.bin
7a1315dd027a0278b881e602f0b21052bd0ee1be546101cede39b4bf088ac835
pdf-font-stream PDF embedded font (sfnt) at offset 0x563E 5524 bytes
font_01_sfnt_off000068ef.bin
639fae0d3ea71791a6942c17152311989704e3411ccd21cc2ece78e2200b724d
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EF 9732 bytes