Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb33f8c8c69fad1…

MALICIOUS

PDF

42.8 KB Created: 2020-08-08 02:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d49445efd494d25d78043d4e6dc2c37d SHA-1: 14340103a81bc557fe8decde0dbebf94b3a972d0 SHA-256: cfb33f8c8c69fad19f4694c0e655056cfab15a9b49e3a87978c990936202898b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link pointing to a redirector service (ttraff.cc) which likely obscures the final malicious destination. The heuristic firings indicate this is a malicious redirector and a link farm, suggesting a phishing or malware distribution attempt. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=core+java+practice+programs+for+beginners+pdf
    • http://files.pmystic.com/uploads/1/3/1/3/131398235/4d47e16dca5.pdf
    • http://dofixaf.thehealthyessence.com/uploads/1/3/0/8/130874064/dulenumasatuxukabota.pdf
    • http://jesite.centralflhomeeducationservices.com/uploads/1/3/1/3/131383791/rupedejodagere.pdf
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/16022865948.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9957/files/11898356580.pdf
    • https://cdn.shopify.com/s/files/1/0437/6464/6049/files/99728941377.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/84557217903.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/git_delete_remote_tag.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2101/files/neroganukujegusatenab.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/sap_basis_certification_material.pdf
    • https://cdn.shopify.com/s/files/1/0437/4793/4359/files/ketogenic_diet_grocery_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/18493033771.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/92778226153.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/84928703598.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_off00006917.bin
19f09ce5dceb5fabcb1b82cf8ad326588f745c5ddd822dfedc36f519ec3d4fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6917 5624 bytes
font_01_sfnt_off00007c26.bin
8316aae9e8d39a0114c02a828aaa5b6dac7087d71d79a4b393a6bf995439021f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C26 9980 bytes