Malicious PDF — malware analysis report

Static analysis result for SHA-256 c406cfd4285ccb72…

MALICIOUS

PDF

41.9 KB Created: 2020-08-31 03:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bfd13b1c71f08f38ae5c1fc16035c79 SHA-1: eca6978c7247f1d424c2af46dcedfdd9dee8d2b0 SHA-256: c406cfd4285ccb72fc4f28387fb27778aa5d53ad95c488b5c638f602206fd302
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.cc/wix?keyword=esguince+de+rodilla+pdf'. The document body, though heavily obfuscated, includes this URL and other Shopify links, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=esguince+de+rodilla+pdf
    • https://cdn.shopify.com/s/files/1/0438/5089/1424/files/sebegesesuler.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/tasisozife.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/aminocidos_estructura.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8696/files/oil_circuit_breaker.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/cadd2_guitar_chord.pdf
    • https://static.usrfiles.com/ugd/1f2646_6cfd53d00cb941d9a84906c361bbc0e1.pdf
    • https://cdn.shopify.com/s/files/1/0438/2192/4514/files/administracion_de_recursos_humanos_dessler.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdf
    • https://cdn.shopify.com/s/files/1/0432/4917/2643/files/11299786769.pdf
    • https://static.usrfiles.com/ugd/c1108c_7ec76627699a4bcf9c255faacd895382.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0d43d1519814115b32301c81109aad9.pdf
    • https://static.usrfiles.com/ugd/99afdc_09a5882e376d46d7b0bfc7dbf8915036.pdf
    • https://static.usrfiles.com/ugd/af0aa9_011f2f60651f45dfa2cc8f2f074b083e.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_off0000630e.bin
274d53b9a1a55fed803597f5037ee0b7d59286ace4c30206ce3b3568d4fd179f
pdf-font-stream PDF embedded font (sfnt) at offset 0x630E 5280 bytes
font_01_sfnt_off0000750e.bin
aa4a11d9102e178683355a034675c3b5647ba1b43f8d5a67f0003af231257b95
pdf-font-stream PDF embedded font (sfnt) at offset 0x750E 11224 bytes