Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8037f4aebc0fcf9…

MALICIOUS

PDF

49.5 KB Created: 2020-08-21 01:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b592633542d17b6f5b68b5198f16b247 SHA-1: c287ef322a154a0e2916acca5ca5ebe12e2b43e6 SHA-256: c8037f4aebc0fcf9c1c83ae997cea5aed20953bcd61489cf0fa456816eb5d1c6
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link redirects to known malicious infrastructure at 'ttraff.ru'. This indicates a link farm or redirection tactic designed to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click the malicious redirector URL, likely leading to a further stage of infection.

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.ru/pify?keyword=android+one+handed+mode+oneplus
    • http://files.bearvalleykidscamp.com/uploads/1/3/1/1/131163957/fakeruxoxizu-jogifuredixazel.pdf
    • http://files.exxcelpainting.com/uploads/1/3/0/8/130873851/bimizifemofezog_pirilegera_jazojit_guzifudofobel.pdf
    • http://xesiwu.dollargeneralpennylist.com/uploads/1/3/1/4/131406352/jejale_reputibub_narisikexafovin.pdf
    • https://cdn.shopify.com/s/files/1/0440/6588/2277/files/livro_de_adestramento_canino.pdf
    • https://cdn.shopify.com/s/files/1/0438/4840/1046/files/upsee_syllabus_for_b._tech.pdf
    • https://cdn.shopify.com/s/files/1/0434/3074/0135/files/60867649555.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/liwukepurenugiweda.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/3d_plot_python.pdf
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/89761480454.pdf
    • https://cdn.shopify.com/s/files/1/0437/8578/1397/files/beer_mechanics_of_materials_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/barreras_fisicas.pdf
    • https://cdn.shopify.com/s/files/1/0430/8461/1737/files/besujoxitepika.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/acuerdo_de_basilea_3.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_off000083c8.bin
930c5be53e3c44dfbed5ba7d1f343d975c1c86279a87372f45c17f6e447d18cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C8 5188 bytes
font_01_sfnt_off00009539.bin
acbbbf8a041b2baadeecb35d75e89edb80b575b4730b48e3d33edf0d4886ae11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9539 10652 bytes

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