Malicious PDF — malware analysis report

Static analysis result for SHA-256 caca4040146a3fee…

MALICIOUS

PDF

46.2 KB Created: 2020-08-30 23:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26addf7c3c1de758e71ad968d0770157 SHA-1: 293325becc15a3d128099685d4cd29dca6657432 SHA-256: caca4040146a3fee73680286d3180b89a1be6f90f56c80bab2efc0bcd0367acd
154 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 one pointing to a known malicious redirector. The heuristic firings indicate this is a link farm designed to manipulate search engine results or distribute malicious content. 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.com/wix?keyword=silver+ravenwolf+pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/tanonirerum.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7549/files/tajamewezotuvizorere.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekugoxozeritazol.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_e0ad69eb6c3c4d749071d74d1a65f452.pdf
    • https://static.usrfiles.com/ugd/105a8c_ee9c9abd46264475bee835294cae772e.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_ecb306776933417b87388fc1e7aacb63.pdf
    • https://static.usrfiles.com/ugd/8d0191_1e37fd4a18044073a76901c415de92ca.pdf
    • https://cdn.shopify.com/s/files/1/0435/1524/8794/files/google_maps_local_guide_gifts.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/raiders_injury_report_today.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4615/files/menemonak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5801/2068/files/11759831601.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_off00007868.bin
ce94cafb828506e0bf27999526ad824d70cbeeb46397821ee2011b186dcb2b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7868 5112 bytes
font_01_sfnt_off000089eb.bin
4908f589e1cc670eefc5ae5be8f60abbbdcecb91d9826f7156628c73566f143e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89EB 10120 bytes

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