Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9401e48ebd87f5…

MALICIOUS

PDF

34.4 KB Created: 2020-08-15 04:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac952490aee1c222a6e5a21ea332503c SHA-1: 0f495c6c86dfe97b61a96e24b6b00077685fda41 SHA-256: 4d9401e48ebd87f5ec581fa988c5199b44e344258ec58cb00982681d52145012
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL as the redirector link, suggesting an attempt to disguise the malicious destination. The primary purpose appears to be directing users to malicious infrastructure via a deceptive link.

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=beautiful+in+white+violin+sheet+pdf
    • http://duroki.livybella.com/uploads/1/3/0/8/130874038/4122697.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1336/files/26893175780.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2894/files/doxotetevurevamepagilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4362/6912/files/ebook_calculus_purcell_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/1845/2120/files/3013048511.pdf
    • https://cdn.shopify.com/s/files/1/0437/2129/3974/files/los_de_abajo_manuel_azuela.pdf
    • https://cdn.shopify.com/s/files/1/0439/0970/9976/files/50329914057.pdf
    • https://cdn.shopify.com/s/files/1/0431/2239/3244/files/segatop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10217245918.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/7851139099.pdf
    • https://cdn.shopify.com/s/files/1/0433/5108/1118/files/culture_media_for_food_microbiology.pdf
    • https://cdn.shopify.com/s/files/1/0432/4399/5298/files/karuvadotoguzibadu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/puxapedekomenonitukazuz.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_off0000492d.bin
b204a104f754e9fccbf5640d70e0a46b52f33944044c9d50f44af7bca2e1794d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x492D 5232 bytes
font_01_sfnt_off00005b18.bin
0549da8c7bb0faca42854ed93cbe8f5e623297d513af6a8f6e0344e4057b60fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B18 9992 bytes

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