Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3f6ec7d0c27ea5…

MALICIOUS

PDF

49.8 KB Created: 2020-07-15 21:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ec39d720b5bfadd5b566e7181941bd0 SHA-1: ff9a9b67f582befe152b627263a8dafa5bad1db9 SHA-256: 5a3f6ec7d0c27ea5e6e523b0975116ab4f6b581eef1cfe48f687a896fca6a2d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, flagged as a link farm, directing to various external PDF files. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful content or further malicious downloads. While no scripts were directly extracted, the nature of the link farm and redirector points towards a malicious document designed for user redirection.

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=arquitectura+bioclimatica+en+mexico+pdf
    • http://files.robin-shapiro.com/uploads/1/3/0/7/130775134/tokikanosadatobol.pdf
    • http://files.cajohnsonconstructioninc.com/uploads/1/3/1/1/131164157/milunolaxuxowafopewi.pdf
    • http://files.craig-main-connection.com/uploads/1/3/2/6/132695633/kipudowesum.pdf
    • http://files.plantshopyyc.com/uploads/1/3/1/6/131606321/d0fe0093d.pdf
    • http://files.malagaholidayrental.com/uploads/1/3/1/0/131070633/655712e6055d3d.pdf
    • http://files.bfdsandiego.com/uploads/1/3/1/8/131856815/kopomodulav.pdf
    • http://files.sandaharrboerboels.com/uploads/1/3/2/6/132681566/6896535.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://daborexawuv.files.wordpress.com/2020/07/dosivodapipes.pdf
    • https://kedojisap.files.wordpress.com/2020/06/5817967342.pdf
    • https://xokapezivivo.files.wordpress.com/2020/07/42774393655.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9027/files/linepivekoburinodawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/gisewov.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8342/files/susefovofel.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/mafaripuvufesalunoxuze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/70213827111.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/83168590698.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/ranuva.pdf
    • https://cdn.shopify.com/s/files/1/0430/0685/3269/files/bafokekubu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008163.bin
3d4256e5b020a3e2032ee1569d703b9f59497b6fa4d3e04f787658c73c624fb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8163 5328 bytes
font_01_sfnt_off0000935c.bin
290a2b54160f6b53a3ccdeed32e304a48d434a50117632291ebbedfcb39adc09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x935C 11124 bytes

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