Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c83b7b79f63dc5a…

MALICIOUS

PDF

46.1 KB Created: 2020-09-05 10:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 45c34a1556db3a8f5b234483d44bcf87 SHA-1: e654b83bade84112d5f54c447560b7e78405b8f3 SHA-256: 8c83b7b79f63dc5a844431c4802aedfba5c4e00987b28e3d34ad1d414b52230d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wix?keyword=rated+r+logo'. It also exhibits characteristics of a PDF link farm, embedding numerous links to other PDFs, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious verdict.

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/wix?keyword=rated+r+logo In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2880/6808/files/rumekupivotakuwofis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/mazuri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4101/2377/files/patasukenilogimelorurukax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6051/7271/files/.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a43ec6_939364f9a2314fd99c78e6daa2314784.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_de660deea5814e5d910bc7ff0c08474d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f96b02_ed7b7a661d084e1db023fe0c87bbe5d9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b97cba_023d1466888d493b92d72b4964b92a0c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/740d8c_8a93fe38619c4da8b4674d58c26698d6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/xaxifaxokux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2576/7320/files/dugil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5388/2280/files/23161312368.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/kukune.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3201/7058/files/61436968211.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6049 4456 bytes
SHA-256: f4624a4e4a1a2989b7b71aeb5199e8ab4ada691c133da45d730e54891dbded40
font_01_sfnt_off00006f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F75 2116 bytes
SHA-256: 8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8
font_02_sfnt_off0000791d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x791D 10660 bytes
SHA-256: 4cf345ea27be1f3dd084382571e3578e07da8a451269f3b6a83f089b62c3ece8
font_03_sfnt_off00009d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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