Malicious PDF — malware analysis report

Static analysis result for SHA-256 354b4e9a45509010…

MALICIOUS

PDF

43.5 KB Created: 2020-08-31 03:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7f71388c14f17187d68b80e31c9c2c2 SHA-1: ec8655ca3fc573a0aca821906c82221f7187aab9 SHA-256: 354b4e9a455090105c85cd044aef1fe0bed4f1e4f38f27f90eed54051899ecf8
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.com), and another identified a large PDF link farm hosted on static.usrfiles.com. The document body, though heavily obfuscated, also contains the suspicious URL. These factors suggest the PDF is designed to lure users to malicious websites.

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=caracteristicas+de+comunidad+pdf
    • https://static.usrfiles.com/ugd/b7082a_82884eae8b5e4c9f992bb4f920a1e996.pdf
    • https://static.usrfiles.com/ugd/0c41e7_79d50711dda745e2a3e0b1713ba9acc9.pdf
    • https://static.usrfiles.com/ugd/9e41f0_03d6d01b5d8247e58dd4c7b344686be3.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_a4cb25eadb7e40ea815d34439dd1565f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dc2bb375e19499ba24623f6837afb66.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_9cb55fe3e9ae4b11b076a575fec78771.pdf
    • https://static.usrfiles.com/ugd/d3758e_5812f587ef2740da9830d2855b326eb0.pdf
    • https://static.usrfiles.com/ugd/6da380_77ab8839c77247648864ea88e02e4a25.pdf
    • https://static.usrfiles.com/ugd/b3bc21_59894c917f5745399911fc35f670752b.pdf
    • https://static.usrfiles.com/ugd/09273f_1243bf008ad04cefbdb5457999f6134f.pdf
    • https://static.usrfiles.com/ugd/90c678_449ae628d3f24c4899aaf8b0c02f9d12.pdf
    • https://static.usrfiles.com/ugd/ce14f3_48beb851efba4df6af09deab94625304.pdf
    • https://cdn.shopify.com/s/files/1/0437/4197/0583/files/reiki_healing_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0435/0102/7493/files/accounting_excel_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9674/files/vulafaperinurajulilaxute.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/16237829392.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/business_analytics_course_content.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_off000069c4.bin
3462523daa4bdf9805ca8d2de148039613a782141f6a22646687d3f4ea52f510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C4 5172 bytes
font_01_sfnt_off00007b42.bin
4720e3ff635d8b1df8decc8fe591889bf660669a42722ebd3db127ecaa021a3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B42 11136 bytes

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