Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce87a9849990691…

MALICIOUS

PDF

47.3 KB Created: 2020-08-11 18:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b37935f2a82741fc5f61bbd445927812 SHA-1: 3985843f8b23e84f2ddaeb0a3ad182e68153463d SHA-256: 8ce87a9849990691baf48e0e26fec220e0ae399a99e976adf75af6528a05f533
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the URL that triggered the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, suggesting a lure to external content. No scripts were extracted, but the sheer volume of links and the malicious redirector indicate a probable attempt to lead the user to a malicious site.

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=augustinisme+politique+pdf
    • http://nasozopo.stbindymusic.com/uploads/1/3/1/1/131164278/lagerofe_kudorafunabuj_zigixim_sadedizigigu.pdf
    • http://sevape.quantumae.net/uploads/1/3/1/0/131070792/juxemago.pdf
    • http://ruzade.farmbuddiesonline.com/uploads/1/3/1/3/131383483/sukovenujunijegavi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5525/1605/files/mijoxekukimusipupuzu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7065/1542/files/42635858081.pdf
    • https://cdn.shopify.com/s/files/1/0434/2425/2055/files/cage_framework.pdf
    • https://cdn.shopify.com/s/files/1/0434/2156/5078/files/nufobixotezesewuzupaliv.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/53320870710.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/67279856082.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/ballast_water_treatment_system.pdf
    • https://cdn.shopify.com/s/files/1/0429/9699/0105/files/understanding_pathophysiology_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2902/0317/files/84711178994.pdf
    • https://cdn.shopify.com/s/files/1/0438/0327/9517/files/zugikakitejazegozazate.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_off000076f8.bin
aa1379a71d6c9e57716bf9ec65fade9c15f32b9239bd0bb98bb9323bb760d1bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F8 5172 bytes
font_01_sfnt_off00008878.bin
eeecfc62d017086a83c43ae2b245fcd2c5feac59a7291919020a300570deef4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8878 12196 bytes

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