Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6c6647e89045b3…

MALICIOUS

PDF

41.0 KB Created: 2020-09-03 10:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9abeb2a14134e955ec95e208d02ec15 SHA-1: de214075983d704e81c356146daca6056eef34f1 SHA-256: db6c6647e89045b3fcf2dc7ad969bf78d52473a1fb71955c24c817bb2a06c4d5
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the primary link `https://ttraff.club/wix?keyword=warm+bodies+movie+free+mp4` identified as a malicious redirector. The heuristic `PDF_SEO_LINK_FARM` indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content through a link farm. 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.club/wix?keyword=warm+bodies+movie+free+mp4
    • https://static.usrfiles.com/ugd/26481d_59654d33922c43c6b561cc74ebe6e332.pdf
    • https://static.usrfiles.com/ugd/b50c55_4f7b2fb4ee6c44cea947c943f2493d91.pdf
    • https://static.usrfiles.com/ugd/55cc32_2b0ae4b48cd2475fa98db0f7fad3ce8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e4f0ebc1dc04cd281f6761e5a259a00.pdf
    • https://cdn.shopify.com/s/files/1/0431/0053/6986/files/wagegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5736/4638/files/malaria_causes_symptoms_treatment_and_prevention.pdf
    • https://cdn.shopify.com/s/files/1/0436/3829/2638/files/sidez.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/vba_excel_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0439/8520/7454/files/alfajr_clock_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/alcoro_em_arabe.pdf
    • https://static.usrfiles.com/ugd/a01749_b81c790f52e04552b13cfee379f54ca6.pdf
    • https://static.usrfiles.com/ugd/b65acf_cb1f97c705374942b69dc6fdac496587.pdf
    • https://static.usrfiles.com/ugd/6c8f37_985fc09e997146fd9e7492b23dcc5e71.pdf
    • https://static.usrfiles.com/ugd/865d50_3fb368bebe724daa9ed34312293ab65b.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_off00006192.bin
6b2b7f16e62421ac940a939c52986626de03fd1b75e5fc1ee81ee94856dd19f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6192 5456 bytes
font_01_sfnt_off0000741b.bin
3a314b264a41b0be726dfa8d30c3959760702cec377914e5f10bdeb6a73c5e5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x741B 10548 bytes