Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e3e3f9e0367aee…

MALICIOUS

PDF

35.8 KB Created: 2020-08-24 20:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac9eae3e718bc119164cc87291334d0e SHA-1: 51ba2ae06b26b63277bf005856c71c77326a2aa5 SHA-256: 19e3e3f9e0367aee03f0ff76313bb916aa6b7a93afa952e83d845857d55a2927
150 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or redirection scheme. The primary malicious URL identified is ttraff.ru, which is known to host redirectors. The document body contains garbled text but also includes the suspicious URL and references to wkhtmltopdf, indicating it was likely generated programmatically to host these links.

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=stars+crash+course+astronomy%2523+26+worksheet
    • http://files.westtexascremation.com/uploads/1/3/0/7/130776211/6183028.pdf
    • http://files.caltempmissionb.org/uploads/1/3/1/3/131379554/nozotenapogewoluraro.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/alter_ego_a1_hachette_cahier_d_exercices_hachette.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/xaradi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1847/files/dumafetikad.pdf
    • https://cdn.shopify.com/s/files/1/0434/4627/2162/files/16541379105.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7086/files/36199009819.pdf
    • https://cdn.shopify.com/s/files/1/0461/7820/5850/files/lizard_island_field_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7014/files/vawazatesotokogatuponuxiz.pdf
    • https://cdn.shopify.com/s/files/1/0438/9856/8859/files/aplicativos_legais_para_android_2018.pdf
    • https://cdn.shopify.com/s/files/1/0440/9622/5432/files/kigobunidojejuzusuxanobo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/gefitoripalu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/70238242778.pdf
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/80121867674.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_off00004f4e.bin
ba5d549895bcb4f81c42aa6f149c238c78a0fdce8ac91c00eda961b059591f85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F4E 5212 bytes
font_01_sfnt_off000060d2.bin
e8f6a867291837fb132b2309ad1ef71705a1cca341745049aa5041ac4569b127		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D2 9900 bytes

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